问题: 一道高二单选题目
--I telephoned you yesterday afternoon, but no one answered .
--Really? My mother was in then , but she ______in bed.
A. must be sleeping
B. must have been sleeping
C. must have slept
D. should have slept
解答:
--I telephoned you yesterday afternoon, but no one answered .
--Really? My mother was in then , but she ______in bed.
A. must be sleeping
B. must have been sleeping
C. must have slept
D. should have slept
选b
对过去事情的肯定推测，就是用must+have done,而这里又表达一个正在，当时她正在睡觉。所以用进行时态。
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