单项选择题

In the preface ____________ my book, I thanked all the people who had been of help to me.

A．of
B．to
C．in
D．for
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单项选择题
Some students have got together to advocate a system ____________ student work without grades.
A．modifying
B．estimating
C．evaluating
D．inspecting
单项选择题
Being objective and modest, a scientist must not ____________ his view on others.
A．apply
B．import
C．impose
D．approve
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