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

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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
单项选择题
The old woman burst into tears at the bad news（）her son had been killed by the enemy.

A．that
B．when
C．which
D．what
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