She smiled happily， a set of amazing white teeth to us.A. exposingB. being exposedC. expos

发布时间：2020-08-17 05:40:29

She smiled happily，     a set of amazing white teeth to us.
A. exposing
B. being exposed
C. exposed
D. to expose

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(答案→)A. exposing
B. being exposed
C. exposed
D. to expose
解析：句意：她高兴地笑着，露出了一副雪白的牙齿。She 与expose是主动关系，所以用现在分词exposing表示伴随，故选A。
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