单项选择题

We shall appreciate ______ from you soon.

A．being heard
B．hearing
C．to hear
D．having been heard
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单项选择题
Mr. Green ______my letter, otherwise he would have replied before now.
A．must have received
B．must have failed to receive
C．must receive
D．must fail to receive
单项选择题
All the reference books should be made ______ to the teachers and students in our university.
A．concerned
B．available
C．related
D．flexible
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