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名词解释：中间件

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名词解释：E-R图

We ________in the neighborhood.

A. happened being
B. happened be
C. happened to be
D. are happened to be

I want your_________, sir. I don t know what to do.

A. advices
B. piece of advices
C. advice
D. advise

At this moment the bell rang, ________ the end of class.

A. announced
B. . having announced
C. announcing
D. to announce