单项选择题

There ______ more than one cause contributing to the accident.

A．were
B．was
C．be
D．have been
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单项选择题
Mary was (surprised to) realize that it was (us), her old (school friends), (calling) her from Paris.
A．surprised to
B．us
C．school friends
D．calling
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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