单项选择题

-- What caused him to quit the job -- ______ behind the counter ail day, facing strange angry faces.

A．Stand
B．Standing
C．He had to stand
D．That to stand
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Her brother likes playing ______ football, while she likes playing ______ piano.
A．a,a
B．×, the
C．the, ×
D．the, the
单项选择题
Failure is the mother of success. ______ your courage.
A．Keep on
B．Keep out
C．Keep up
D．Keep up with
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