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．each of which
C．which
D．that
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单项选择题
The notice was written in several languages ______ foreign tourists should misunderstand it.
A．so that
B．lest
C．if
D．otherwise
单项选择题
His mother is going to stay in Beijing for ______.
A．some times
B．some time
C．sometime
D．sometimes
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