单项选择题

We must（）on water during the dry season.

A. economical
B. economize
C. economy
D. economically

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单项选择题
There was plenty of time. She（）.

A. mustn't have hurried
B. needn't have hurried
C. mustn't hurry
D. couldn't have hurried
单项选择题
You are no longer a boy. You（）do things for yourself and not always depend on your parents.

A. will
B. ought
C. can
D. should
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