单项选择题

Mr. Brown did not tell us () or not he'll be leaving next week.

A．whether
B．if
C．either
D．weather

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单项选择题
Not until the bell had rung () the classroom in a hurry.

A．he came into
B．did he come into
C．he has come into
D．has he come into
单项选择题
Since we have never been here before, we do not know which bus ().

A．should we take'
B．to be taking
C．to take
D．should take
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