By the time the tornado ended, more than 700 people _________.
A．have killedB．had been killedC．were killedD．had killed
B
考查時(shí)態(tài)和語(yǔ)態(tài)。By+過(guò)去的時(shí)間，主句用過(guò)去完成時(shí)；by+將來(lái)的時(shí)間，主句用將來(lái)完成時(shí)。句意“到龍卷風(fēng)結(jié)束的時(shí)候，已經(jīng)有700多人被害�！备鶕�(jù)ended可知，是過(guò)去的時(shí)間，主句用過(guò)去完成時(shí)；people和kill之間是動(dòng)賓關(guān)系，應(yīng)該用被動(dòng)語(yǔ)態(tài)。故選B。
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