18．-Hi，Mike，I saw Jim in the zoo just now．
-It ______ be him．He has gone to Beijing．（　�。�
A．can'tB．mustC．mustn'tD．can

分析 --嗨，Mike，我剛才在動(dòng)物園看見Jim了．
--不可能是他．他去北京了．

解答 答案：A．
can't不可能；must一定，必須；mustn't不可以；can可能．根據(jù)He has gone to Beijing，可知Jim去北京了，所以那個(gè)人不可能是他．can't不可能．故選A．

點(diǎn)評 本題考查了情態(tài)動(dòng)詞的用法．解答時(shí)注意理解句意以及所給選項(xiàng)的意思并作出正確選擇．

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