问题

There is no doubt________man will continue to explore the vast universe in the future, but the rate at which we approach depends on the development of technology.[ ]

A: whether
B: what
C: when
D: that

正确答案是：

同类题型

The priest made the ________ of the cross whenhe entered the church

is surprising to us is that Tom, for _______English was once boring, can speak English fluently as though he were a nativespeaker.

I’m sorry I spent so much money, Dad !— I wish you______so.[ ]

ed a lot of questions, and none of______ was easy to answer

_______was the movie last night—It was wonderful.