单项选择题

Are you going downtown this afternoon I'm going to have these letters（）

A．to mail
B．mail
C．mailed
D．mailing

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单项选择题

（）you have to do is more practice.

A．All that
B．All what
C．That
D．which

单项选择题

It was in this room（）the conference was held.

A．where
B．in which
C．that
D．which

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