【題目】I_______ my homework when the door bell__________.

A. did, rang B. was doing, was ringing

C. did, was ring D. was doing, rang

【答案】D

【解析】

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。

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