17.____all the inventions have in common is ____they have succeeded.A.What; what B.That; that C.what; that D.That ; what 答案是C没有疑问,什么从句?

问题描述:

17.____all the inventions have in common is ____they have succeeded.
A.What; what B.That; that C.what; that D.That ; what
答案是C没有疑问,什么从句?

what all the inventions have in common是主语 因为主语成分残缺,所以用WHAT 不用THAT.
后半句宾语从句,THAT 确定。

What all the inventions have in common中的What引导的是主语从句,而后面的they have succeeded做的是表语只能用that引导~~