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
Anthropologists usually study simple, unindustrialized societies because the number of()is limited.

A. vehicles
B. variables
C. varieties
D. systems
单项选择题
I didn't help him. I would have ()I didn't have the money.

A. or
B. but
C. otherwise
D. still
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