A. could B. should C. might D. must
答案:D
分析:对过去情况的肯定推测,用must have done。
(2) He ____ have completed his work; otherwise, he wouldn't be enjoying himself by the seaside. (北京2005)
A. should B. must C. wouldn't D. can't
答案:B
分析: 同上题。
(3) I _____ have been more than six years old when the accident happened.
A. shouldn't B. couldn't C. mustn't D. needn't
答案:B
分析:对过去的否定推测用 can't/couldn't have done。
19.introduce vt.
(1) 介绍
Let me introduce myself first. 先让我作一下自我介绍。
May I introduce you to Mr. Brown? 让我介绍你跟布郎先生认识好吗?
(2) 引进,提出
They introduced the idea that children could learn to read as babies.
他们提出在婴儿阶段就可教小孩认字这个想法。
Who introduced the bad idea? 谁提出的这个糟糕的想法?
They introduced a topic for discussion. 他们提出议题供讨论。
(3) (以---)开始
I introduced my class with a funny story. 我以一个有趣的故事开始我的课。
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