多项选择题

We've done once but failed. We'll have to do it ______ time.

A．a second
B．the second
C．the twice
D．twice
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多项选择题
I am ______ to hear from you soon.
A．waiting
B．looking forward
C．expecting
D．seeing
多项选择题
They ______ going to see my mother this Sunday.
A．both
B．both are
C．are both of
D．are both
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