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
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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
单项选择题
I've got a very ______ schedule today so I can't see you until tomorrow.
A．serious
B．big
C．tough
D．tight
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