Thousands of trees must _______ every year.[ ]A. plantB. be planted C. have been planted D. have planted-初中英语-n多题

◎ 题干

Thousands of trees must _______ every year.

[ ]

A. plant
B. be planted
C. have been planted
D. have planted

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◎ 解析

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◎ 知识点

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