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故選 D。 B Practice ( )21. You mustn’t go off on your own, because you _______ get lost in the mountains. A. should B. must C. need D. might 【 解析 】 考查情態(tài)動(dòng)詞的用法。情態(tài)動(dòng)詞表推測:“一定” 用 must,“可能”用 might、 may、 could;“一定不”用 can’t。 C Practice ( )37. —Who’s the man over there? Is it Mr. Black? —It ______ be him. He’s much taller. A. may not B. can’t C. will not D. mustn’t 【 解析 】 考查情態(tài)動(dòng)用法。 may “可以 ” ; must “必須 ” ;should “應(yīng)該 ” 。 B Practice ( )21. A country has dreams. We teenagers ________ also have dreams. With dreams and hard work, anything amazing can be created. A. may B. must C. should 【 解析 】 考查情態(tài)動(dòng)詞 。 句意: —我們現(xiàn)在可以跑著過馬路嗎 ? —不 , 不可以 , 我們必須等到綠燈亮 。t D. shouldn39。t B. mustn39。故選 C。 may 【 解析 】 考查情態(tài)動(dòng)詞的用法。 must C. needn39。 can B. needn39。 DPractice ( )8. — Mum, must I stay there the whole day? — No, you________. You _______ e back after lunch, if you like. A. mustn39。句意為:當(dāng)交通燈變紅,你“必須”停下來?!? 可知“這個(gè)書包一定是吉姆的?!?,故選 B。 will將要,表意愿; must 必須;應(yīng)該,表猜測時(shí),用于肯定句,意為“一定”,可能性較大; can能,會(huì),表猜測時(shí),常用于否定句和疑問句; might 可能,表猜測時(shí),可能小。 CPractice ( )20. — Good morning. I39。根據(jù)標(biāo)志可知為禁止浪費(fèi)水的標(biāo)志。故選 A。根據(jù)前后句意可推斷對方在詢問“我必須馬上打掃教室嗎?”。 mustn’t。 can’t。 mustn’t。 needn’t。 must表示推測時(shí),意為“一定 ……” ,用于肯定句;根據(jù)答語“她已經(jīng)去了紐約”可知是否定推測,故選 A。 Practice ( )23. — Who’s singing in the next room? — It _____ be her. She has gone to New York. A. can’t B. must C. shouldn’t D. can 【 解析 】 考查情態(tài)動(dòng)詞表推測。 —When can I e for the photos? I need them tomorrow. —They should be ready by 12:00. It’s nearly seven o’clock. Jack should be here at any moment. Presentation — _______ I borrow your MP3? — Sure. Here you are. A. May B. Should C. Must D. Would — Is John ing by train? — He _______, but he may not. He likes driving his car. A. must B. c