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19.-You ____ have put your ideas forward to the boss in person.Using email would be OK.
-But that was not nearly as effective.(  )
A.can'tB.needn'tC.shouldn'tD.mustn't

分析 ---你没有必要亲自向你的老板提出你的想法,用发电子邮件的办法就可以了.
---但是那样几乎不起作用.

解答 答案:选B
needn't 不需要,没有必要;can't 不能,不会;shouldn't 不应该;mustn't 则表示禁止.
根据Using e-mail would be OK.(用发电子邮件的办法就可以了.)的提示,所以你没有必要亲自向你的老板提出你的想法.故选B.

点评 本题考察的是情态动词的否定形式,所以需要记住它们本身所含的意义.

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