题目内容

—Let’s go dancing tonight.!
—Sorry, I ________.I have to go to my guitar lesson.
A. mustn’t              B. needn’t             C. can’t
C
情态动词的用法。本题意思为“我们今天晚上去跳舞吧!”“对不起，我不能去，我得去上吉他课。”从答句中的have to“不得不”可以知道前面是表达不能去跳舞。不能是can’t.故本题答案为C。
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