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    【题目】She _________the sign language before she served as a volunteer to help the deaf.

    A. learns B. has learned

    C. was learning D. had learned

    【答案】D

    【解析】试题分析：句意：她作为一名志愿者来帮助聋人之前已经学习了手语。由句意可知，学习手语在做一名志愿者之前，是过去的过去，用过去完成时，故选D。

    考点: 考查动词时态的用法。

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