单项选择题

He ______unwisely, but he was at least trying to do something helpful.

A．may have acted
B．must have acted
C．should act
D．would act
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单项选择题
Craig assured his boss that he would ______ all his energies in doing this new job.
A．call forth
B．call at
C．call on
D．call off
单项选择题
A．pioneerB．settlersC．immigrantD．ancestors
A．pioneer
B．settlers
C．immigrant
D．ancestors
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