He had fallen asleep ____11 o’clock last night.A.at B.about c.by d.since

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Hehadfallenasleep____11o’clocklastnight.A.atB.aboutc.byd.sinceHehadfallenasleep____11o’clocklastnigh

He had fallen asleep ____11 o’clock last night.A.at B.about c.by d.since
He had fallen asleep ____11 o’clock last night.A.at B.about c.by d.since

He had fallen asleep ____11 o’clock last night.A.at B.about c.by d.since
这题选C,过去完成时最常见的标志就是by +time

By, 表示过去时间之前用过去完成时