题目内容
13．-Let's go climbing，shall we？-You______be joking!Don't you know I'm afraid of high places？（ ）
| A． | must | B． | can | C． | may | D． | should |
分析 --让我们去爬山，好吗？
--你一定是在开玩笑，难道你不知道我恐高吗？
解答 答案：A．
can可以，能够，should应该，may可能，must必须，一定．也表示肯定的推测．根据Don't you know I'm afraid of high places，可知我恐高，所以你一定是在开玩笑．must必须，一定．故选A．
点评 本题考查了情态动词的用法．解答时注意理解句意以及所给选项的意思并作出正确选择．
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