题目内容
20．-Look!It ______ be the new woman manager．-It ______ be her．She has just left for Shanghai．（ ）
| A． | can； mustn't | B． | must； can't | C． | must； mustn't | D． | can't； must |
分析 --看！它一定是新来的女经理．
--不可能是她．她刚动身去上海．
解答 答案：B．在英语中表示肯定的推测常用must be，表示否定的推测常用can't be，根据It ______ be the new woman manager，可知这里应该是表示一种肯定的推测，意思是它一定是新来女经理；再根据She has just left for Shanghai，可知那个人不可能是她，因为她刚动身去上海了．故选B．
点评 本题考查了情态动词的用法．熟知句意以及所给选项的意思是解答本题的关键．
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