the carpet is really dirty. it needs to be( ). 是以s开头的单词,包含9个字母.

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the carpet is really dirty. it needs to be(   ).  是以s开头的单词,包含9个字母.

the carpet is really dirty. it needs to be( ). 是以s开头的单词,包含9个字母.
the carpet is really dirty. it needs to be( ).
是以s开头的单词,包含9个字母.

the carpet is really dirty. it needs to be( ). 是以s开头的单词,包含9个字母.
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sweeping清扫
need to be doing嘛

sanitated

the carpet is really dirty. it needs to be groomed.
不是 substituted (那是代替), 可以用 replaced (替换)