【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，你在做什么？when后用的是過去時，所以主句也應(yīng)該用過去時，故排除AC；這里考查過去進(jìn)行時，表示從句動作發(fā)生在主句動作過程中。故選B。

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