—Has your father got up?
—Sorry, I’m not sure. He got up. Please go and see for yourself.
A. must have
B. can’t have
C. would have
D. might have
网友回答
A. must have
B. can’t have
C. would have
(答案→)D. might have
解析：must have done一定做过某事，用于肯定句中，疑问句否定句中用can或could来代替，表示对过去事实比较肯定的猜测。might have done可能做了某事，用于肯定句和否定句中，表示对过去事实不太肯定的猜测。由I’m not sure可知并不肯定，故选D。