How long do you think it will be _______ scientists succeed in providing a cure for cancer?
#92242
A
when
B
after
C
since
D
before
推荐题目
—“Did you have any difficulty in yesterday’s homework?”—  “No, in fact I found _____.”
#92654
A
it very easy to do
B
it very easy done
C
very easy for doing
D
very easy to do it
— Did you take enough money with you?   — Yes, but I spent ________ I had expected.
#93459
A
not so many as
B
as many as
C
much more than
D
much less than
-Why didn’t you go to the party ?_______ an invitation, I would have gone to the party .
#93730
A
Had I received
B
If I received
C
If I should receive
D
Were I to receive
________Chinese culture with overseas cultures is a challenging job, but you will learn a lot from it. 
#93106
A
Comparing .
B
Having compared .
C
Compared .
D
Compare .