单项选择题

More than thirty people are ______ in this event.

A．happened
B．participated
C．involved
D．included
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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
单项选择题
The manager promised to have my complaint ______.
A．looked through
B．looked into
C．looked over
D．looked after
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