单项选择题

It was not ______ 1982 that he went back to America.

A．since
B．until
C．before
D．after
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单项选择题
While discovering the cause of a serious illness,
A．the illness should be cured immediately
B．the patients should be taken good care of
C．the doctor should give the patient good care
D．the effective measure should be taken
单项选择题
This new instrument is far superior ______ the old one we bought three years ago.
A．than
B．to
C．over
D．of
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