【題目】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:世界自然基金會自1961年以來一直是最重要的慈善機(jī)構(gòu)之一。A. was一般過去時;B. has been現(xiàn)在完成時;C. had been過去完成時;D. would be過去將來時。since 19611961年以來,表示到目前為止的時間段,用于現(xiàn)在完成時態(tài)的句子中,故答案為B。

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