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Liveinjapan  #516998  Thu, 22 May 08 07:48 AM
Add to that the serendipity of the Berkeley team viewing the same region with an optical light telescope. 

How does the underlined part work in the sentence?

 

Thanks

 

 

  
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Please feel free to correct any words I wrote.LiJ
Cool Breeze  #517003  Thu, 22 May 08 08:33 AM
 Hi LiJ

Add is a verb (imperative), to is a preposition add requires and that is a demonstrative pronoun which refers to something mentioned previously.

CB 

  
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Liveinjapan  #517009  Thu, 22 May 08 08:42 AM
I found where that refers, and I understand the whole sentence.

Thanks, CB. 

  
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