单项选择题

While watching television, ______.

A．the telephone rang
B．we heard the telephone ring
C．we heard the telephone rang
D．the telephone was rung
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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
单项选择题
John Locke, the well-known 18th century English thinker, emphasized experience as the ______ condition for expansion of human knowledge.
A．incompatible
B．incredible
C．indefinite
D．indispensable
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