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In some countries, people ______ downloa...

In some countries, people ______ download (下载) music from the Internet without paying, because it’s against the law.

A. wouldn’t    B. needn’t    C. mustn’t    D. couldn’t

 

C 【解析】句意: 在一些国家,人们不付钱禁止从互联网下载音乐,因为这是违反法律的。考查情态动词辨析。A. wouldn’t 不会,不愿意; B. needn’t 不必; C. mustn’t 禁止; D. couldn’t不可能。结合句意和语境可知选C。 点睛:must是情态动词,没有人称或数的变化,后接动词原形,其主要用法如下: 1.表示义务或必要性,意思是“应该、必须”,通常用于肯定句及疑问句.如: You must go to bed now.你现在必须睡觉了.2.must的否定式是must not/ mustn’t,意思是“不应该、禁止”,语气较强烈.如:You must not smoke here.你不许在这里吸烟.3.由must引出的一般疑问句,肯定回答用must,否定回答用needn’t,don’t need to或don’t have to均可,但不用mustn’t,因为mustn’t表示“不许、禁止”的意思,与问句的原意不符.如:—Must I stay at home?我必须留在家里吗?—Yes,you must.是的,你必须留在家里.(No,you needn’t.或No,you don’t have to.)(不,不用了.)4.如果是反意疑问句,疑问部分一般不用needn’t,而用mustn’t;否定回答时仍用needn’t,don’t need to或don’t have to.如:—You must go on foot,mustn’t you?你必须走着去,是吗?—Yes,I must.是的,是这样.(No,I needn’t.或No,I don’t have to.) (不,不是的.)5.当说话人对所发生的事情进行推测时,must的意思是“一定、准是”,主要用于肯定句,否定推测常用can’t.如:He must be a doctor.他一定是个大夫.注意:must表示推测,用于反意疑问句时,疑问部分不能用must,应与其后面的动词保持一致.如:(1)She must be home,isn’t she?她一定在家里,是吗? (2)Tom must have a sister,hasn’t he?/ doesn’t he?汤姆肯定有一个妹妹,是吗?  
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