单项选择题

He doesn't smoke now, but he ______ two years ago.

A．am used to it
B．used to
C．used
D．used to do
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单项选择题
Evil Under the Sun , ______ is a famous detective story, is written by a Christie.
A．which
B．that
C．it
D．what
单项选择题
You ______ be too careful when you are driving.
A．should
B．needn't
C．cannot
D．must
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