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

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(yīng)用被動語態(tài)。故選B。
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