单项选择题

More has been learned since 1945 about the chemical changes in the body than in all human history before ______ time.

A．in
B．that
C．which
D．the
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单项选择题
He was told he could join the army when he ______ old enough.
A．would be
B．should be
C．was
D．were
单项选择题
After talking to the old woman for a while, her fear and timidity ______.
A．went away
B．stopped
C．disappeared
D．left behind
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