18．-Is that man our headmaster Mr Li？
-It ________ be him．Mr Li has gone to Beijing on business．（　�。�
A．may notB．can'tC．won'tD．mustn't

分析 --那個(gè)人是我們的李校長(zhǎng)嗎？--不可能是他．李校長(zhǎng)去北京出差了．

解答 答案：B．may not不可以；can't不可能；won't將不會(huì)；mustn't禁止．根據(jù)Mr Li has gone to Beijing on business，可知李校長(zhǎng)去北京了，那個(gè)人不可能是李校長(zhǎng)．can't不可能，故選B．

點(diǎn)評(píng) 本題考查了情態(tài)動(dòng)詞的用法．熟知句意以及所給選項(xiàng)的意思是解答本題的關(guān)鍵．

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