2019-2020学年外研版高中英语选修6课件:语法填空课件6
2019-2020学年外研版高中英语选修6课件:语法填空课件6第2页

--Sorry, Mum! I failed the job interview again. --Oh, it’s too bad. You ____ have made full preparations.

should

【情态动词】

Only when Lily walked into the office _____ she realize that she had left the contract at home.

did

【助动词】