单项选择题

I'd appreciate ______ these letters.

A．you to mail
B．you mail
C．your mailing
D．you would mail
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单项选择题
The news says: An airline ______ kills more than 100 passengers.
A．crash
B．smash
C．rash
D．crush
单项选择题
The committee is ______ session; no one can enter the hall.
A．on
B．at
C．in
D．for
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