单项选择题

His ______ in German as well as English earned him the chance to work in the prestigious college.

A．deficiency
B．sufficiency
C．efficiency
D．proficiency
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单项选择题
You ______ John in the street this morning. He's been dead for ages.
A．mustn't see
B．mustn't have seen
C．couldn't see
D．couldn't have seen
单项选择题
People in that district ______ use oil lamps, for there is no gas or electricity.
A．can
B．may
C．must
D．have to
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