单项选择题

It's very informal here, you ______ wear a tie unless you want to.

A．don't have to
B．must not
C．could not
D．may not
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单项选择题
When I got to the station the train ______ left.
A．already had
B．had already
C．has already
D．already has
单项选择题
The teacher should explain the lesson, ______
A．shouldn't he
B．should he
C．doesn't he
D．does he
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