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

A.must put B.must be put C.are putting D.is put

B

解析试题分析:句意为:植树的时候,树必须直立放到坑里。根据语境,句子的主语是“the trees”,是动作的承受者,应用被动语态。故选B。
考点:考查被动语态。

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