题目内容
【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】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。
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题目内容
【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】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。
