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' ve been working on my vocabulary actively, and one way to ______ it is to see films in English on TV.
A．go down
B．go up
C．improve
D．decrease
单项选择题
I ______ talk that way if I were Frank.
A．won' t
B．didn' t
C．couldn' t
D．wouldn' t
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