It was not until the beginning of the twentieth century________to explore space.
#93086
A
did man begin
B
when man began
C
that man began
D
then man began
推荐题目
You didn’t use to like him much when we were at school, ___________?
#93746
A
were we
B
weren’t we
C
did you
D
didn’t you
I don’t think he could have done such a stupid thing last night, _____?
#95203
A
did he
B
could he
C
do I
D
hasn’t he
If _______, I will go to visit your new house tomorrow.
#93895
A
ou are convenient
B
ou will be convenient
C
t will be convenient for you
D
t is convenient for you