单项选择题

The noise was so ________ that only those with excellent hearing were aware of it.

A．dim
B．soft
C．faint
D．gentle
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单项选择题
It is difficult for us to explain phenomena that we have little or ________ direct knowledge.
A．no any
B．no
C．none
D．nothing
单项选择题
It is necessary that we ________ have a good command of English at college.
A．must
B．have to
C．should
D．ought to
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