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Hello,

Could you help me please?I should learn the answer to the following question,please.

"The Asian spa resorts have acquired a formidable reputation for their services..............for the decor of their large treatment rooms."

which the best complete the space.

a-as well as b-also c- in addition d-besides

"Also" can't be the answer because it is used after auxiliary verb

"in addition" can't be the answer,either.Because after "in addition" a clause is used. If the choice were "in addition to" instead of "In addition " it would be the aswer.so which one?"as well as" or "besides" and why?please help me.
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Hi. Welcome to English Forums.
Pasam"Also" can't be the answer because it is used after auxiliary verb
Not always, but it's not suitable in the given sentence.
Pasamn addition" can't be the answer,either.Because after "in addition" a clause is used. If the choice were "in addition to" instead of "In addition " it would be the aswer
After "in addition to" must go a noun or a clause.
Pasam"The Asian spa resorts have acquired a formidable reputation for their services as well as for the decor of their large treatment rooms."
As well as is a conjuction.

Besides can be a preposition and can be an adverb. It introduces an additional point of view. It can mean "in addition to, as well as" while being used as a preposition.Something is interesting of usage of this word is here:
It is sometimes said that beside should not be used to mean ‘apart from’ and that besides should be used instead (he commissioned work from other artists besides Minton rather than he commissioned work from other artists beside Minton). Although there is little logical basis for such a view, and in standard English both beside and besides are used for this sense, it is worth being aware of the potential ambiguity in the use of beside: beside the cold meat, there are platters of trout and salmon means either ‘the cold meat is next to the trout and salmon’ or ‘apart from the cold meat, there are also trout and salmon’. Beside is the word to use in the phrases beside the point and beside oneself. [Oxford Dictionary]

Such a choice can't be used here because of "for".
There are some modification of your example to see the difference:

"The Asian spa resorts have acquired a formidable reputation for their services. Besides [adverb], the decor of their large treatment rooms is good, too."
"The Asian spa resorts have acquired a formidable reputation for their services besides [preposition] the decor of their large treatment rooms."
Comments  
'as well as' is best.
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 Fandorin's reply was promoted to an answer.

as well as

Maybe as well as?
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