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The floor of the attic needs ____if we are going to make it

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The floor of the attic needs ____if we are going to make it into a bedroom.空白为什么只能...
The floor of the attic needs ____if we are going to make it into a bedroom.空白为什么只能填strengthening而不能填strengthened?
The floor of the attic needs ____if we are going to make it
need(需要)作及物动词,后面可接不定式或名词化的动名词作宾语.接不定式时表示主动;接名词化的动名词时有被动的含义,相当于不定式的被动语态.