单项选择题

A．I must be careful not to catch cold.
B．I am careful and never catch cold.
C．I’ll take care of the boy who has caught a cold.
D．The boy is very cold.
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单项选择题
He seldom has lunch at school, ______
A．hasn't he
B．has he
C．doesn't he
D．does he
单项选择题
His success was due to ______ he had been working hard.
A．that
B．the fact which
C．the fact that
D．the fact of
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