单项选择题

Forty percent ______stopped smoking in that company.

A．has
B．is
C．have
D．are
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单项选择题
Tom looks so pale today. He ______ill.
A．must be
B．had to be
C．should be
D．shall be
单项选择题
George did ______than anyone else.
A．much work
B．more work
C．work much
D．work more
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