A. needn't have done B. must not have done C. shouldn't have done D. can not have done 10、The weather turned out to be fine yesterday. I ___ the trouble to carry my umbrella with me. A. should have taken B. could have taken C. needn't have taken D...
23. I will never forget what you have done. 你的恩情我没齿难忘。 24. How can I show you how grateful I am? 你不知道我是多么的感激你! 25. Your generosity overwhelms me. 谢谢...
13. All that can be done ___. a. has done b. has been done c. have done d. have been done 14. One or perhaps more pages ___. a. is missing b. has been missed c. are missing d. was missing 15. More than one worker ___ dismissed. a. have been ...
s not surprising even normal parental anxiety can be amplified. And many middle-class parents have gotten used to managing their children’s time and shuttling them to various enriching activities, so the idea of letting them out on their own can s...
2) 情态动词 除ought 和have 外,后面只能接不带to 的不定式。 3) 情态动词没有人称,数的变化,即情态动词第三人称单数不加-s。 4) 情态动词没有非谓语形式,即没有不定式,分词,等形式。 比较can 和be able to 1)can could 表示能力;可能(过去时用could), 只用于现在式和...
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