单项选择题

I am looking forward to______ from you as soon as possible.

A．hear
B．be hearing
C．hearing
D．have heard
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单项选择题
There are no lights on and no one answer the doorbell. They______ be at home.
A．must not
B．will not
C．should not
D．can not
单项选择题
He found it necessary for us______ from each other.
A．to help and learn
B．helping and learning
C．to learn and to help
D．learning and helping
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