Only when he had done it ______ that he had made a mistake.
#82881
A
he then realized
B
did he realize
C
before
D
he realized
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Only by learning more about different cultures _______ avoid misunderstanding during international cooperation.
#82121
A
we can
B
we should
C
should we
D
can we
We must apply what we have learned to our daily work because in no case_____ from practice.
#81130
A
should theory separate
B
theory should be separated
C
theory should separate
D
should theory be separated
—Are you a volunteer now?—No, but I _____. I worked for the City Sports Meeting last year.
#81899
A
used to
B
used to be
C
used to do
D
was used to
Only after they had discussed the matter for several hours ________ a decision.
#79568
A
they reached
B
did they reach
C
they reach
D
do they reach