英语 八年级 填空题 简单

情态动词can/could表能力 — 英语填空题

教科版·英语 Unit 5 Animals Helping People AI 三重审校通过

题目
My dog is very clever. When he was only six months old, he ___ already fetch things for me. Now he ___ even open the door by himself, but a cat ___ not do such things. (用 can/could 的适当形式填空)