They demanded that the books________ to the school library at once. 
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A
return
B
should return
C
be returned
D
would be returned
推荐题目
Without electricity human life _____ quite different today.  
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A
is
B
will be
C
would have been
D
would be
At last he       finish the work ahead of time.
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A
could
B
was able to
C
could have done
D
would have been able to
If I hadn’t stood under the ladder to catch you when you fell, you _________ now.
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A
wouldn’t be smiling
B
couldn’t have smiled
C
won’t smile
D
didn’t smile