单项选择题

You（）return the book now. You can keep it till next week if you want to.

A．do not have to
B．haven't
C．can't
D．mustn't

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单项选择题

（）the new teacher appeared at the door, the students stopped talking.

A．As soon as
B．For the moment
C．While
D．The time

单项选择题

The child is lonely; he would be happier if he had someone that he could play（）

A．about
B．for
C．with
D．at

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