One of the workers A(has) B(hung) the curtains that C(had) been D(laying) on the floor.

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问题 One of the workers A(has) B(hung) the curtains that C(had) been D(laying) on the floor.

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答案D

解析 改为lying。lie表示“躺,位于”时,过去式是lay,现在分词是lying。而lay为动词“放置,搁放”的原形,如lay the table。此处为前者,故用lying。
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