问题
翻译题
用couldn't/can't/must/might/may/could should have done完成句子。
1. 她不可能步行去那里.
She couldn't _____ there.
2. 你本可以做得更好,但是你没有尽力而为.
You could ____ better, but you didn't try your best.
答案
1. have walked 2. have done