The children have planted trees and flowers since they ___Greener China.A.joined B.took part in C.became D.were

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The children have planted trees and flowers since they ___Greener China.A.joined B.took part in C.became D.were

The children have planted trees and flowers since they ___Greener China.A.joined B.took part in C.became D.were
The children have planted trees and flowers since they ___Greener China.
A.joined B.took part in C.became D.were

The children have planted trees and flowers since they ___Greener China.A.joined B.took part in C.became D.were
A
加入团体、组织等用join.