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

A. joined
B. took part in
C. became
D. were
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The children planted more trees and flowers after they ______ Greener China. [ ]A. joined B. took part in C. became D. were …”主要考查了你对  【实义动词的过去式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。