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Whenweleaveourhomes,weshould

问题详情:

Whenweleaveourhomes,weshould

When we leave our homes, we should _____power machines and water tap to save energy.

              A. turn on    B. turn off    C. turn up         D. turn down

【回答】

B

知识点:动词和动词短语

题型:选择题

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