题目内容
I'm sorry that I have kept you _________ outside for so long.
[ ]
A. standing
B. stand
C. to stand
D. to be standing
B. stand
C. to stand
D. to be standing
A
练习册系列答案
相关题目
---I have a bad cold.
---_______________.
| A.No problem. | B.Yes, you don’t look well |
| C.Thanks. | D.I’m sorry to hear that. |