单项选择题

You ______ him that the day before.

A．ought not to have told
B．must not have told
C．should not tell
D．ought not to tell
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单项选择题
They ______ more enthusiastic about their work since their teacher's return.
A．are
B．were
C．had been
D．have been
单项选择题
People of one culture moving to a country of another culture may ______ their old ways.
A．keep up
B．give up
C．look back at
D．clear away
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