单项选择题

21（）

A．warm
B．hot
C．heated
D．cool

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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
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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