题目内容
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
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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