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Evidence of a powerful volcano, which erupted under the ice sheet of West Antarctica around 325BC and might still be active now, __________ so far by British scientists.

A. confirmed B. has confirmed

C. is confirmed D. has been confirmed

D

【解析】

試題分析:考查現在完成時的被動語態。句意:大約公元前325年在南極洲西部冰原下爆發的強大的火山,現在可能仍然活躍,迄今為止已被英國科學家證實。由句意知道,火山已經爆發,時間是發生在過去,句中now說明和現在有聯系,so far一般用于現在完成時,故該時態應為現在完成時,然后evidence應該是被確認,故應該用現在完成時的被動式,答案為D。

考點:考查現在完成時的被動語態

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