单项选择题

When you are at your（）end，you should not lose your head.

A．wit's
B．wit
C．wits'
D．wits's

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填空题
Encyclopedias can be used to acquire knowledge in any field，to obtain informations on a particular subject，or to deal with other academic questions.
单项选择题
That not-well-planned proposal leaves（）room for discussion.

A．much
B．a big
C．a bigger
D．a much bigger
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