---- What was wrong with you yesterday evening?
---- I ____ my homework when the light went off suddenly.
A．doingB．was doingC．didD．have done
B
考查情景交際。“昨晚你怎么了？”“我正在做作業(yè)時，突然斷電了。”過去某時刻正在發(fā)生的事情用過去進行時。故選B。
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