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

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单项选择题
（） new employee feels insecure during （） first few weeks on the job.

A．Many ...their
B．Many...his or her
C．Many a ...their
D．Many a...his or her
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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