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
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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
单项选择题
______, the new medicine is now in mass production.
A．With the solved problem
B．With this problem being solved
C．With the problem solved
D．With this problem to solve
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