题目内容

There ____ pencil-box, two books and some flowers on the desk.

A. is a
B. are some
C. has a
D. have some

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It’s important _______ you to learn Chinese well.

A. of
B. by
C. for
D. with

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励磁调节器的5个辅助控制功能分别是什么?

电力系统中可靠性与安全性的定义分别是什么?

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