单项选择题

Theory could not do without practice, ______ without theory.

A．practice could do neither
B．practice could neither do
C．neither practice could do
D．neither could practice do
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单项选择题
He doesn t work but he gets a good ______ from his investment.
A．wage
B．earning
C．income
D．salary
单项选择题
He ______ smoking at last.
A．gave up
B．gave out
C．gave in
D．gave off
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