单项选择题

To test his theory, the chemist ______ an experiment.

A．set up
B．set out
C．set forth
D．set in
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单项选择题
While watching television, ______.
A．the telephone rang
B．we heard the telephone ring
C．and to play football
D．the telephone was rung
单项选择题
All the references she has obtained for her doctoral dissertation ______ about twenty items.
A．make up for
B．add up to
C．come up with
D．put up with
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