超星 - 独立结构3 - 查题吧

单选题

_____ in thought, he almost ran into the car in front of him.

A. Lost
B. As he was lost
C. He lost
D. A and B

单选题

_______for the bus at the stop, he suddenly caught sight of a thief.

A. Waiting
B. When he was waiting
C. As he was waiting
D. all the above

2