单项选择题

--What do you suppose made her worried
-- ______ her gold watch.

A．Lose
B．To lose
C．Lost
D．Losing
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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
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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