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
Reading ______ the mind only with materials of knowledge; it is thinking that makes what we read ours.
A．rectifies
B．prolongs
C．minimizes
D．furnishes
单项选择题
She refused to ______ the door key to the landlady until she got back her deposit.
A．hand in
B．hand out
C．hand down
D．hand over
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