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
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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
单项选择题
It is useless trying to persuade him to adopt our suggestion; he is such a______ man.
A．tough
B．strict
C．stubborn
D．stern
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