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情态动词【示例】I have lost one of my gloves. I _____ it somewhere. A.must drop B.must have dropped C.must be dropping D.must have been dropped 解析:must have done表示“过去一定做了某事”。句意为：我丢了一只手套，我肯定是掉在什么地方了。 答案：B 1. Some young people these days just___________ go out of the Internet bars into the real world． A．mustn’t B．shouldn’t C．won’t D．needn’t 【答案】C 【解析】句意：进来一些年轻人不愿意走出网吧到现实来。won’t“不愿意”符合句意。 2. What's your opinion of Mr．Li's request that we ______ spend half an hour reading English aloud every morning? A．must B．would C．should D．could 【答案】C 【解析】考查request的用法。request 后面的名词性从句要用虚拟语气，即主语+（should）+动词原形。 3. I didn’t see her in the conference room this morning. She ________ have done the presentation at the meeting. A. couldn’t B. shouldn’t C. needn’t | 
