单项选择题

I have heard both teachers and students ______ well of him.

A．to speak
B．spoken
C．to have spoken
D．speak
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单项选择题
I hope all the precautions against air pollution, ______ suggested by the local government, will be seriously considered here.
A．while
B．since
C．after
D．as
单项选择题
We have been told that under no circumstances ______ the telephone in the office for personal affairs.
A．may we use
B．we may use
C．we could use
D．did we use
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