单项选择题

The number of articles published on cancer ______ amazing.

A．is
B．are
C．have
D．have been
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单项选择题
Jane ______ as soon as she recognized it was her former boy friend's voice.
A．called up
B．waited on
C．took up
D．rang off
单项选择题
______ what to do, the man telephoned the police.
A．Not known
B．Not knowing
C．Don't know
D．Knowing not
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