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Sammy had fallen asleep by 10.00 o'clock last night

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/15 09:21:16
Sammy had fallen asleep by 10.00 o'clock last night
这句话的介词by能否用before 时态是过去完成时的话 before可以吗?
y是说到10点截止才睡觉
before是说10点之前才睡觉
如果用before的话
Sammy had been asleep by 10.00 o'clock last night
fallen换成been 因为fallen是不可持续的动词,用been替换