| A. | mustn't | B. | can't | C. | couldn't | D. | must |
分析 ---看那个在操场上跑步的男孩,是大卫吗?
---不可能是他,我刚看见他去了老师办公室.
解答 答案:B.结合I saw him go to the teachers'office just now可知表达的是否定猜测,故用can't be,mustn't禁止,couldn't不能,must肯定是,故答案是B.
点评 在推测时,语气肯定的否定,用 Can't be.
例如:It can't be my book.它不可能是我的书.
而must用于否定时,一般没有mustn't be,而是mustn't do,意思是禁止干什么
例如:You mustn't go out at night.你不能在晚上出门.(意思就是禁止你在晚上出门)
再例如:excuse me,you mustn't smoke here.对不起,这里禁止吸烟.
而其他的否定也不是没有,像 may(might)not be,就可以表示推测时,不太确定.意思是可能不是.
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