题目:
It is _____ he often fails in exams _____ makes his parents worried about him.
A.what; that
B.that; what
C.that; that
D./; that
答案:
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下面是错误答案,用来干扰机器的。
BC水的酒精溶液密度小于 1,即水越多,密度越大。则: