题目内容

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】

试题分析：考查现在完成时的被动语态。句意：大约公元前325年在南极洲西部冰原下爆发的强大的火山，现在可能仍然活跃，迄今为止已被英国科学家证实。由句意知道，火山已经爆发，时间是发生在过去，句中now说明和现在有联系，so far一般用于现在完成时，故该时态应为现在完成时，然后evidence应该是被确认，故应该用现在完成时的被动式，答案为D。

考点：考查现在完成时的被动语态

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