When (see) ______ through a telescope, the sun appears darker near the edge.

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问题 When (see) ______ through a telescope, the sun appears darker near the edge.

选项

答案seen

解析 分词作方式状语,需与主语保持态的一致。see和the sun呈动宾关系,所以sun作主语时,see应用过去分词。句意:从望远镜里看太阳,边缘部分要暗些。
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