问题补充:
- Can you go to row a boat with us this afternoon?
- Im afraid not. I look after my little sister because my mother is out.
A. can
B. may
C. would
D. have to
答案:
A. can
B. may
C. would
(答案→)D. have to
解析:句意:--今天下午,你能与我们去划船吗?--我恐怕不能。因为我的母亲外出了,我不得不照顾我的小妺妺。分析由于自己不能去参加活动,体现不得不。 故选D