问题补充:
It’s only six o’clock now; Little Tom should be up ,though, because he for nine hours.
A. has been sleeping
B. had been sleeping
C. has slept
D. had slept
答案:
(答案→)A. has been sleeping
B. had been sleeping
C. has slept
D. had slept
解析:考查时态。根据语境可知汤姆一直在睡,现在还在睡,故用现在完成进行时,故选A。