Some people often feel depressed when the leaves on the tree______yellow in the fall.

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问题 Some people often feel depressed when the leaves on the tree______yellow in the fall.

选项 A、turning
B、turn
C、turns
D、to turn

答案B

解析 句意:在秋天一些人看到树叶变黄就会感到沮丧。When引导的状语从句表示动作同时发生。
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本试题收录于: 英语题库普高专升本分类
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