单项选择题

I know nothing about our teacher ______ he's been teaching for years.

A．besides
B．but
C．except
D．except that
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单项选择题
______ an answer, he decided to write another letter to them.
A．Having been received
B．To have received
C．Having received
D．Being received
单项选择题
Anything dropped falls towards the center of the earth because of ______.
A．weight
B．gravity
C．density
D．attraction
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