题目

He knows so much about the story. He must have read the book,_____? A. mustn’t he  B. doesn’t he C. hasn’t he   D. didn’t he 答案：C 解析: “He must have read the book”中must 表示“一定，想必”等推测意义，而不表示“必须、禁止”等意义。“He must have read the book”相当于 “I’m sure he has read the book”相一致，即用hasn’t he, 而不用mustn’t he。已知铁的比热容小于铝的比热容．质量相同的铁块和铝块吸收相同的热量后，    温度升高的多；若它们降低相同的温度，    放出的热量多．