【題目】What _________ when the earthquake happened on May 12th?
A.are you doing
B.were you doing
C.do you do
D.did you do

【答案】B
【解析】句意：當(dāng)5月12日地震發(fā)生時(shí)，你在做什么？when后用的是過(guò)去時(shí)，所以主句也應(yīng)該用過(guò)去時(shí)，故排除AC；這里考查過(guò)去進(jìn)行時(shí)，表示從句動(dòng)作發(fā)生在主句動(dòng)作過(guò)程中。故選B。

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