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

試題分析：句意：她高興地笑著，露出了一副雪白的牙齒。She 與expose是主動(dòng)關(guān)系，所以用現(xiàn)在分詞exposing表示伴隨，故選A。
考點(diǎn)：
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