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