【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:當水力發(fā)電機故障時,美國歷史上最大的停電開始了。

本題考查動詞短語。was breaking down是過去進行時;broke down是一般過去時;was broken down是一般過去時的被動形式。break down分解,出故障,沒有被動形式,沒有進行時,故選C。

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