Question

George ________ toSan Fransisco because I saw him just a moment ago.

1. A.
   mustn’thave gone
2. B.
   can’t go
3. C.
   couldn’tgo
4. D.
   can’t havegone

Answer 1

D
虛擬語氣，can’t have done表示對過去事實的推測，意為“肯定沒有……”。