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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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
Anyone breaking the roles will be asked to leave ______.
A. at the spot
B. on the spot
C. for the spot
D. in the spot
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