when he came home,I___for three hours.a.have fallen asleep b.had fallenasleep c.had been asleep d.have slept

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whenhecamehome,I___forthreehours.a.havefallenasleepb.hadfallenasleepc.hadbeenasleepd.havesleptwhenhe

when he came home,I___for three hours.a.have fallen asleep b.had fallenasleep c.had been asleep d.have slept
when he came home,I___for three hours.a.have fallen asleep b.had fallenasleep c.had been asleep d.have slept

when he came home,I___for three hours.a.have fallen asleep b.had fallenasleep c.had been asleep d.have slept
C..这里是过去完成时时态.睡觉是在他回到家之前发生的.所以前一个动作睡觉要用过去完成时.后面用一般过去时.

c.had been asleep

C