填空题

A. understood
B. took
C. pollute
D. rude

【参考答案】

B

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单项选择题

A. is developing
B. has developed
C. develops
D. is being developed

单项选择题

In arithmetic the rules of addition are basic, and all the other rules are built on this ()

A. basis
B. bases
C. base
D. basises

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