Woolen clothes are used for _ warm.A.kept B.keep C.to keep D.keeping 应该选哪个啊?

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Woolen clothes are used for _ warm.A.kept B.keep C.to keep D.keeping 应该选哪个啊?
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Woolen clothes are used for _ warm.A.kept B.keep C.to keep D.keeping 应该选哪个啊?
Woolen clothes are used for _ warm.A.kept B.keep C.to keep D.keeping 应该选哪个啊?

Woolen clothes are used for _ warm.A.kept B.keep C.to keep D.keeping 应该选哪个啊?
D keeping
be used for doing sth.被用于做某事
for是介词,后跟动词的ing形式