-Canyougotorowaboatwithusthisafternoon?   -I'mafraidnot...

问题详情：

- Can you go to row a boat with us this afternoon?

    - I'm afraid not. I_______ look after my little sister because my mother is out.

    A. can                B. may               C. would            D. have to

【回答】

D

知识点：情态动词

题型：选择题