The new model the market in three months, all the shops are now selling the old model at

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A. hitting
B. hit
C. having hit
(答案→)D. to hit
解析：考查非谓语动词。句意：新版的将在三个月内上市，所有的商店都在打折出售老版的。根据in three months可知，这里是指将来，不定式可以表示将来，相当于which is to hit/ which will hit。故选D。