题目内容
14．-It_______ be John who is still working in the office．-I'm sure it_______ be John．I saw him off at the airport just this morning．（ ）
| A． | would； shouldn't | B． | may； mustn't | ||
| C． | must，can't | D． | can； needn't |
分析 --那一定是仍然在办公室工作的约翰先生．
--我确定不可能是 John．今天早上我在飞机场看到他离开了．
解答 答案：C
根据第二个空，“I'm sure it_______ be John．I saw him off at the airport just this morning”知为否定推测“不可能”，为can't．shouldn't（不应该）、mustn't（禁止）、needn't（不需要、不必），均不可表推测．故均可排除A、B、D选项．选项C，第一个空中用must表肯定的推测，符合情态动词用法．故选C．
点评 本题考查了情态动词表猜测的用法．这是中考的必考内容，考生需特别注意mustn't表禁止，解答时注意区分和辨别句意以及所给选项的意思．
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