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 ---你沒有必要親自向你的老板提出你的想法，用發(fā)電子郵件的辦法就可以了．
---但是那樣幾乎不起作用．

解答 答案：選B
needn't 不需要，沒有必要；can't 不能，不會；shouldn't 不應該；mustn't 則表示禁止．
根據(jù)Using e-mail would be OK．（用發(fā)電子郵件的辦法就可以了．）的提示，所以你沒有必要親自向你的老板提出你的想法．故選B．

點評 本題考察的是情態(tài)動詞的否定形式，所以需要記住它們本身所含的意義．

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