题目内容
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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