单项选择题

As no one in the small village (knew) (nothing) about medicine, Mrs. Smith, a for-mer 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
(For several) years now, the student body (is attempting) to gain (more) influence (over) university policies.
A．For several years now
B．is attempting
C．more
D．over
单项选择题
(If) the experiment succeeds or fails, it will (provide us) with valuable (experience) which is essential to (improving) our future work.
A．If
B．provide us
C．experience
D．improving
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