题目内容

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.
1. have walked    2. have done
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