—It’s hot here. Why not your coat?—OK.A. take offB. taking offC. to put onD. put on

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(答案→)A. take off
B. taking off
C. to put on
D. put on
解析：考查固定句式。why not do sth表示建议，后面接动词原形，意思是为什么不…联系上文，这很热，为什么不脱掉你的外套，put on穿上，take off脱下，故选A。