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
We shall probably never be able to ______ the exact nature of these sub-atomic particles.
A．assert
B．impart
C．ascertain
D．notify
单项选择题
Connie was told that if she worked too hard, her health would ______
A．decay
B．deteriorate
C．descend
D．degrade
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