By the time the tornado ended more than 700 people .A. have killedB. had been killedC. we

问题补充：

By the time the tornado ended, more than 700 people .

A. have killed

B. had been killed

C. were killed

D. had killed

答案：

A. have killed

(答案→)B. had been killed

C. were killed

D. had killed

解析：考查时态和语态。By+过去的时间，主句用过去完成时；by+将来的时间，主句用将来完成时。句意“到龙卷风结束的时候，已经有700多人被害。”根据ended可知，是过去的时间，主句用过去完成时；people和kill之间是动宾关系，应该用被动语态。故选B。

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