单项选择题

Doctors sometimes ______old cures when modem medicine doesn’’t work.

A．fall on
B．fall down on
C．fall back on
D．fall in upon
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单项选择题
A writer has to ______imagination as well as his experiences for his writing.
A．draw back from
B．draw in
C．draw up
D．draw on
单项选择题
He is the only person who can ______ in this case, because the other witnesses were killed mysteriously.
A．testify
B．charge
C．accuse
D．rectify
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