单项选择题

I don't know ______ yesterday.

A．why didn't he go to school
B．why he didn't go to school
C．when he didn't go to school
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单项选择题
It's ______ to go to school.
A．the time
B．a time
C．time
单项选择题
You will miss the bus if you ______ hurry.
A．not
B．don't
C．aren't
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