He was having dinner____a unknown woman knocked at the door.填when还是while?
人气：280 ℃ 时间：2020-01-28 23:08:33
解答
whenwhywhen表示就在这时，发什么。。。，表示突然、意外可以while也有这种用法啊while，没有它只是表示伴随，没有意外的成分
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