单项选择题

They ______ us because of the noise then.

A．mustn"t have heard
B．needn"t have heard
C．couldn"t have heard
D．might not heard
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单项选择题
He ought to go by plane, ______
A．ought he
B．shouldn"t he
C．won"t he
D．wouldn"t he
单项选择题
It was a point of ______ with the teachers to be responsible for the students.
A．honor
B．principle
C．discipline
D．rule
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