【題目】Everyone should play a part_____the earth.

Ato save Bsaved

Cfor saving Din saving

【答案】D

【解析】句意每個人在保護(hù)地球方面起著重要作用。play a part in doing在某事上起作用。根據(jù)語意和選項(xiàng),故答案選D。

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