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When you are planting trees, the trees ________ straight in the hole.
A.must putB.must be putC.are puttingD.is put
B

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。
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