------Could you please sweep the floor?
------___________. I am busy looking after my sister.
| A．Yes, sure | B．Sorry, I couldn’t |
| C．No problem | D．Sorry, I’m afraid not |
------Could you please sweep the floor?
------___________. I am busy looking after my sister.
| A．Yes, sure | B．Sorry, I couldn’t |
| C．No problem | D．Sorry, I’m afraid not |
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