单项选择题

That was so serious a matter that I had no choice but ______ the police.

A．called in
B．calling in
C．call in
D．to call in
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单项选择题
More than thirty people are ______ in this event.
A．happened
B．participated
C．involved
D．included
单项选择题
Had he worked harder, he ______ the exams.
A．must have got through
B．would have got through
C．would get through
D．could get through
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