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题目
题型:不详难度:来源:
When you are planting trees, the trees ________ straight in the hole.
A.must putB.must be putC.are puttingD.is put

答案
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。
核心考点
试题【When you are planting trees, the trees ________ straight in the hole.A.must putB】;主要考察你对过去进行时等知识点的理解。[详细]
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