单项选择题

As no one in the small village (knew) (nothing) about medicine, Mrs. Smith, a former nurse, (had to) work (as) a doctor.（）

A．knew
B．nothing
C．had to
D．as

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单项选择题
Susan, you are so lazy. This job （） hours ago.

A．should have finished
B．could have finished
C．ought to have been finished
D．must have finished
单项选择题
Two TV cameras （） eyes of a mechanical man.

A．are served as
B．serve as
C．will be serve as
D．were serve as
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