题目内容

【题目】_____ all the inventions have in common is ______ they have succeeded.
A. What; what
B. That; what
C. What; that
D. That; that

【答案】C
【解析】第一空既是主语从句的(谓语have)宾语,又是主句的主语,所以应该填what;第二空用that来引导表语从句.

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