单项选择题

A．after
B．before
C．until
D．when
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单项选择题
A．Families with cars.B．Americans’ heavy dependence on cars.C．Roads and highways.D．Traffic problems in America.
A．Families with cars.
B．Americans’ heavy dependence on cars.
C．Roads and highways.
D．Traffic problems in America.
单项选择题
A．call onB．call forC．call inD．call forth
A．call on
B．call for
C．call in
D．call forth
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