【題目】The biggest blackout in American history began when the hydroelectric generator________.

A.was broke downB.was breaking downC.broke downD.was broken down

【答案】C

【解析】

句意:當(dāng)水力發(fā)電機(jī)故障時(shí),美國(guó)歷史上最大的停電開(kāi)始了。

本題考查動(dòng)詞短語(yǔ)。was breaking down是過(guò)去進(jìn)行時(shí);broke down是一般過(guò)去時(shí);was broken down是一般過(guò)去時(shí)的被動(dòng)形式。break down分解,出故障,沒(méi)有被動(dòng)形式,沒(méi)有進(jìn)行時(shí),故選C。

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