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【题目】WWF ________ one of the most important charities since 1961.

A. was B. has been C. had been D. would be

【答案】B

【解析】

句意:世界自然基金会自1961年以来一直是最重要的慈善机构之一。A. was一般过去时;B. has been现在完成时;C. had been过去完成时;D. would be过去将来时。since 19611961年以来,表示到目前为止的时间段,用于现在完成时态的句子中,故答案为B

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