问题描述：
把句子改为祈使句
you can't cross the street at the moment.
you must be quiet in the library.
we can take a bus to the TV station.
she has to sweep the floor today.
you mustn't be worried about your lessons.
you can't cross the street at the moment.
you must be quiet in the library.
we can take a bus to the TV station.
she has to sweep the floor today.
you mustn't be worried about your lessons.
问题解答：
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