试题:
_____ all the inventions have in common is ______ they have succeeded.
A.What; whatB.That; whatC.What; thatD.That; that

答案:

我来补答
C
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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这些题目你会做吗?