题目内容
17．-Excuse me，sir，visiting hours are over．You ___________ leave．-Pardon me，nurse．I didn't hear the bell．（ ）
| A． | may | B． | can | C． | must | D． | need |
分析 --打扰了，先生，探望时间结束了，你必须离开．
--护士，请原谅我，我没有听见铃声．
解答 答案：C．
结合选项可知本题考查情态动词，首先明确选项中每个单词的意思：A：可以；B：能够；C：必须；D：需要； 根据设空处前面的句子visiting hours are over，结合题干推测设空处句子的句意是"你必须离开．
"，这是医院的规定，所以 must符合句意，故选C．
点评 本题考查了情态动词的用法．解答时首先根据题干明确句意，理解所给选项中每个情态动词的意思并熟练掌握它们的用法，便可作出正确选择．
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