题目内容

She smiled happily，________ a set of amazing white teeth to us.
A．exposingB．being exposed
C．exposedD．to expose
A

试题分析：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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