问题

_____ all the inventions have in common is ______ they have succeeded.
A:What; what
B:That; what
C:What; that
D:That; that
B:That; what
C:What; that
D:That; that
正确答案是:
同类题型
I can’t remember those grammar rules!—____________. Practice more.
Don’t be . You can’t make such great progress in a day. It takes time.
This is _____ pen and ________ is in the pencil-case.
The boy, _________ his father, ________ fishing.
He requested that all the soldiers _____ the news secret. [ ]