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
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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
单项选择题
The most important ________ of his speech was that we should all work whole-heartedly for the people.
A．element
B．spot
C．sense
D．point
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