单项选择题

The city ______ a new look ______ the four new squares were built.

A．took on, before
B．has taken on, since
C．takes on, since
D．has been taken on, after
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单项选择题
The headmaster required that all the teachers ______ at the meeting.
A．present
B．must be present
C．be present
D．would be present
单项选择题
Your mother must be at home, ______ she.
A．mustn't
B．doesn't
C．isn't
D．needn't
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