Only when we failed ________ the importance of study.
#81037
A
we realized
B
we had realized
C
did we realize
D
had we realised
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It was not until 1978_____ set free from the prison.
#80908
A
that the old professor was
B
did the old professor
C
was the old professor
D
that was the old professor
Only when the fire was under control       to return to their homes.
#82459
A
the residents would be permitted   
B
had the residents been permitted
C
would the residents be permitted
D
the residents had been permitted
_______Chinese which city is famous for ice and snow, and the answer is sure to be Harbin.
#83046
A
f you ask a
B
sked some  
C
sk any 
D
aving asked every