题目内容
15．---________ David be the new chairperson of the Students'Union？---He _______ be，but I'm not sure．（ ）
| A． | Can； can't | B． | Can； may | C． | May； must | D． | May； mustn't |
分析 --David 可能成为新的学生会主席吗？
--他可能会成为，但我不确定．
解答 答案：B．can"能""可能"，may可以；can't"不能""不会""不可能"，must"必须""一定"，mustn't"禁止""一定不能做"．can和may在表示可能性上，can的语气比may要强烈，may要显得婉转．而且can多用于口语，在正式用语中多用may．can表示可能，多用于否定句与疑问句．根据but I'm not sure，可知我不确定，所以--David 可能会成为新的学生会主席，在这里用may，may可能，表示推测，但是这种可能性不大．故选B．
点评 本题考查了情态动词的用法．解答时注意may在表示推测时，可能性比must要小．
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