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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单项选择题
-- Why do you think he is a liar -- We have proved ______ many times.
A．so
B．as much
C．him
D．it
单项选择题
I have ______ today.
A．a headache
B．headaches
C．the headache
D．headaching
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