The light went out while I ____my homework.
问题描述:
The light went out while I ____my homework.
A.did B.do C.am D.was doing
说明原因
答
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】