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Hello to you all.
I`d like to ask you a question about the following sentence as a part of a grammar-testing module:

Bob is left-handed, ___ no one else in our family is.
a. which
b. who
c. that
d. for which

Which is said to be the correct answer but it sounds quite unusual to me. Apart from the test, are there any other opportunities to fill in the gap without changing the meaning of the sentence?

I`d appreciate any help. Thank you in advance.
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Nashira Nashare there any other opportunities to fill in the gap without changing the meaning of the sentence?
Yes. You can use but.

In the original question which is the only answer that fits. It's unusual because which refers to the adjective left-handed. (which, we are told, "always" refers to nouns or to complete sentences, but that rule doesn't work here.)

CJ
Comments  
That`s what I was thinking doing the test. Thanks for confirming my thoughts.