The light went out while I ____my homework.A.did B.do C.am D.was doing说明原因

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ThelightwentoutwhileI____myhomework.A.didB.doC.amD.wasdoing说明原因ThelightwentoutwhileI____myhomework.A

The light went out while I ____my homework.A.did B.do C.am D.was doing说明原因
The light went out while I ____my homework.
A.did B.do C.am D.was doing
说明原因

The light went out while I ____my homework.A.did B.do C.am D.was doing说明原因
The light went out while I ____my homework.
A.did B.do C.am D.was doing
选项是D
句意是:“当我正在做我的家庭作业时,灯灭了”.
选项D.was doing表示【灭灯时The light went out】,我正在在我的家庭作业,符合题意.
went out是过去时,排除选项B和C.选项A.did【不表示正在进行的动作】

D
while I was doing 表示我正在做作业的时候

D.was doing
while引导的时间状语从句中常常用进行时态, 正当,,,,

D.was doing
过去进行时,表示2个动作同时发生。

D .前面有went,说明是过去时。b,c不选。然后光灭了是瞬间的动词,做作业是较长的一段动作,所以用进行时

D, while + Be + ing form

D.was doing. 我正在写作业的时候灯灭了。