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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单项选择题
—I was pleased to hear the news. --So ______.
A．do I
B．am I
C．was I
D．did I
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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