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Thechildrenplantedmoretreesandflowersafterthey

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问题详情:

Thechildrenplantedmoretreesandflowersafterthey

The children planted more trees and flowers after they ______ Greener China.

    A. joined                B. took part in     C. became            D. were

【回答】

 A  

知识点:动词和动词短语

题型:选择题

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