单选题 Sally (must have called) her sister last night, but she (arrived) home (too late) to call (her).

A、 must have called
B、 arrived
C、 too late
D、 her

【正确答案】 A

【答案解析】[解析] 应改为should have called。本题考查must have done与should have done的区别：must have done是对过去情况的肯定猜测，意思是“一定做了某事”；should have done意思是“本该做某事(事实上没做)”，根据句意应该是“本该做某事”。