【題目】While they (discuss) how to prevent accident, another accident happened.

【答案】were discussing
【解析】句意:正當(dāng)他們?cè)谟懻撊绾晤A(yù)防事故的時(shí)候,又一個(gè)事故發(fā)生了。while正當(dāng)……的時(shí)候,引導(dǎo)的從句通常用進(jìn)行時(shí)態(tài),跟主句中的過去式happened可知應(yīng)填過去進(jìn)行時(shí)were discussing。

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