I_______ my homework when the door bell__________.
A．did, rangB．was doing, was ringing
C．did, was ringD．was doing, rang
D

試題分析：根據(jù)題干，本句的意思是“當門鈴響的時候，我正在做作業(yè)。”當句中用when時，從句應用過去時，主句用過去進行時。所以本題選D。
點評：本題比較容易和while引導的時間狀語從句響混淆。While引導的時間狀語從句中，主句可以用進行時，也可用過去時，但從句應該用進行時。
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