When you are planting trees, the trees ________ straight in the hole.A．must putB．must be putC．are puttingD．is put-初中英语-n多题

◎ 题干

When you are planting trees, the trees ________ straight in the hole.

A．must put

B．must be put

C．are putting

D．is put

◎ 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“When you are planting trees, the trees ________ straight in the hole.A．must putB．must be putC．are puttingD．is put…”主要考查了你对【一般现在时】，【过去进行时】，【过去完成进行时】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。

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