原题:
题型:单项选择-四个选项
— _________you go skating with me this Saturday, Mary?
— I’m afraid I _________. I’ll help my old neighbor fix his washing machine that day.
— I’m afraid I _________. I’ll help my old neighbor fix his washing machine that day.
| A.Could; couldn't | B.Could; can | C.Can; can’t | D.Can; could |
题目考点:情态动词的使用,表示能力或许可
