单项选择题

It is necessary that we ______ have a good command of English at college.

A．must
B．have to
C．should
D．ought to
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单项选择题
I remember her face but I cannot ______ where I met her.
A．recall
B．remind
C．remember
D．remark
单项选择题
Leading cadres launch rectification campaigns at regular ______ to hear the masses' views.
A．interaction
B．intervals
C．interruptions
D．interpretation
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