When I try to understand ____ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
#85001
A
why does it
B
what does it
C
what it is
D
why it is
推荐题目
It was in the school ____ he had studied ____ he began the important experiment.
#85485
A
that; where
B
in which; which
C
where; that
D
where; in which
-----______you received the news ?------Last night .
#85310
A
When was it that
B
When was it
C
When it was that
D
When it was
If you have a job,          yourself to it and finally you’ll succeed. 
#84666
A
do devote
B
don’t devote
C
devoting
D
not devoting