He insisted that the book _______ to the school library at once.
#88003
A
return
B
should return
C
be returned
D
would be returned
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At last he       finish the work ahead of time.
#89655
A
could
B
was able to
C
could have done
D
would have been able to
. I ____ to the top of the tree, but I fell off it and hurt my leg.
#88189
A
must have climbed
B
was able to climb
C
could have climbed
D
should have climbed