I’m sure David when we get home.
A. is still sleeping
B. is to be sleeping
C. will still be sleeping
D. will have been sleeping
网友回答
A. is still sleeping
B. is to be sleeping
(答案→)C. will still be sleeping
D. will have been sleeping
解析：考查时态：句意：我确定当我们到的时候，大卫将正在睡觉。When引导的时间状语，用一般现在时表示一般将来时，主语应该是将来范畴的动作，而且当我们到的时候，大卫是正在睡觉。选C。