You must have made the mistake,_______?
| A．mustn't you |
| B．haven't you |
| C．didn't you |
| D．hadn't you |
---Do you mind my opening the window? It's a bit hot in here.
---_______, as a matter of fact.(2009 .全国Ⅱ)
A. Go ahead
B. Yes,my pleasure
B. Yes,my pleasure
D. Come on
---I wonder if I could possibly use your car for tonight.
---_______I'm not using it anyhow，（2006．全国工）
| A．Sure, go ahead. |
| B．I don't know. |
| C．Yes,indeed. |
| D．I don't care. |
---Could you be so kind as to close the window?
--- _______ (2009．安徽)
| A．With pleasure. |
| B．Go ahead. |
| C．Yes,please. |
| D．That's OK. |
Could I speak to_______is in charge of International Sales please? (2009 .海南)
| A．who |
| B．what |
| C．whoever |
| D．whatever |