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

A．must put B．must be put C．a(chǎn)re putting D．is put

B

解析試題分析：句意為：植樹的時候，樹必須直立放到坑里。根據(jù)語境，句子的主語是“the trees”，是動作的承受者，應用被動語態(tài)。故選B。
考點：考查被動語態(tài)。

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