【題目】My father ________ in a panda protection center for ten years, so he knows a lot about pandas.

A.was workingB.is workingC.has worked

【答案】C

【解析】

句意：我爸爸在熊貓保護(hù)中心工作了十年，所以他對(duì)熊貓很了解。

考查時(shí)態(tài)。was working過(guò)去進(jìn)行時(shí)；is working現(xiàn)在進(jìn)行時(shí)；has worked現(xiàn)在完成時(shí)；根據(jù)“for ten years”可知是用現(xiàn)在完成時(shí)，故選C。

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