【題目】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】試題分析：句意：她作為一名志愿者來(lái)幫助聾人之前已經(jīng)學(xué)習(xí)了手語(yǔ)。由句意可知，學(xué)習(xí)手語(yǔ)在做一名志愿者之前，是過去的過去，用過去完成時(shí)，故選D。

考點(diǎn): 考查動(dòng)詞時(shí)態(tài)的用法。

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