题目内容

It’s difficult to __________ the recent increase in violent crime.

A. making use of
B. account for
C. in contact with
D. clean up

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______yesterday, we had no idea where the child was.

A. making use of
B. account for
C. in contact with
D. up to

The ticket for this play is so high that the audience ________mainly ______ rich people.

A. making use of
B. account for
C. consist of
D. clean up

简述独立光伏发电系统的工作原理?

简述独立光伏发电系统的组成及组成部分的作用。

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