单项选择题

Hardly（）when a loud explosion was heard.

A．the train had started
B．the train had been started
C．had the train started
D．did the train start

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单项选择题
So little（）about mathematics that the lecture was completely beyond me.

A．I know
B．I knew
C．do I know
D．did I know
单项选择题
The room is in a terrible mess; it（）cleaned.

A．mustn't have been
B．shouldn't have been
C．can't have been
D．wouldn't have been
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