问题描述：
一道定语从句选择题（需要详细说明）
Which of the buildings_____are being built will be a school gymnasium?
A.that B.which C./ D.they
请帮忙详细说明为什么是A,B和C为什么不可以
Which of the buildings_____are being built will be a school gymnasium?
A.that B.which C./ D.they
请帮忙详细说明为什么是A,B和C为什么不可以
问题解答：
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