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
Do you know anything about the traffic accident ______ near our school yesterday
A．happened
B．happening
C．which happened
D．which was happened
单项选择题
Now it is rather difficult for us to______ of living without cars and telephones.
A．perceive
B．imagine
C．envisage
D．conceive
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