神马品牌网陈相文将军夫人女儿:Welcome!
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_____ You didn’t hear the door bell?
_____ No, I must ______ soundly at that time.
A. have slept
B. be sleeping
C. have been sleeping
D. sleep
Key :C
Why not choose B ?Pease tell me, thanks !
_____ No, I must ______ soundly at that time.
A. have slept
B. be sleeping
C. have been sleeping
D. sleep
Key :C
Why not choose B ?Pease tell me, thanks !
选C，must have done是对过去的推测
must be doing是对现在的推测
很显然，此句是对过去的推测
而且是过去进行时，表示动作发生时“我”正在做的事情。
C强调过去的情景，根据后面的at that time可以判断
同意三楼的
c