It may be 5 or 10 years __________ it is possible for people to find a space station on the moon.
#30830
A
since
B
before
C
after
D
when
推荐题目
It's important to learn how the whole system works. Sometimes, ________， it's the details that interest us the most.
#32141
A
therefore
B
meanwhile
C
furthermore
D
though
We’ve given her some advice, but I don’t know________ she’ll accept it．
#30103
A
what
B
where
C
whether
D
Which
________ you prefer, I'll give it to you. But we haven't any other models for you to choose from.
#31084
A
Whatever
B
Whenever
C
Whichever
D
However