English is a subject we should attach great importance.A. whichB. thatC. to whichD. for

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A. which
B. that
(答案→)C. to which
D. for which
解析：
这题考查定语从句，从句中用了attach great importance缺了介词to，表示“对…重视”，所以用to which。句意是：英语是我们应该重视的科目。