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15.-Is it good for me to look up every new word while reading?
-No.You    ,because you may get the meaning from the text.(  )
A.don't have toB.shouldn'tC.can'tD.mustn't

分析 ---在阅读的时候,每一个生词都去查字典对我有好处吗?
---不,没有必要.因为你可以从文中悟出词意.

解答 答案:A   
A.don't have to 不必,没有必要;B.shouldn't 不应该; C.can't 不能,不会;不可能; D.mustn't 禁止,不允许;根据句意可知,阅读时,没有必要每一个生词都去查字典,因为你可以从文中猜出词意.故选A

点评 本题考查了一个比较特殊的情态动词have to的用法.它与其他的情态动词不同,它有人称、数和时态的变化.表示客观上的需要,强调被迫性,有"不得不"的含义;它的否定形式为:don't/doesn't/didn't have to,意为"不必要",相当于needn't.做此类题时,需要熟练掌握各情态动词的意义及用法.

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