I________gotobed________therewas

发布时间:2020-07-26 11:44:02

I ________ go to bed ________ there was a knock on the door.A.was about to; whenB.was going to; whenC.was about to; whileD.was going to; then

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A解析be about to与when连用,可表示“正要干什么,另一事情发生了”。when是并列连词。
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