单项选择题

Ford proposed a system ______ each worker would have a special job to do.

A．that
B．which
C．in which
D．at which
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单项选择题
To make up an objective test, the teacher writes a series of questions, ______ has only one correct answer.
A．some of which
B．which
C．each of which
D．that
单项选择题
I don t think he is serious, ______
A．do I
B．is he
C．don"t I
D．isn"t he
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