More than 20 people ________ in traffic accidents ________ last May.
A. have died for B. have died since
C. have been dead since D. have been dead for
C
句意:自从去年五月,超过20 个人在交通事故中死亡。since last May,自从去年五月,一段时间。和一段时间连用,用延续性的动作或状态。die对应的延续性的状态是be dead. 动作从过去延续到现在,用现在完成时态,故选C。
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