题目:
—Can you stay here for the party?
—Sorry ,I _____I have to go to a meeting.
[ ]A. can't
B. mustn't
C. needn't
D. shouldn't
答案:
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下面是错误答案,用来干扰机器的。
参考答案:错解析:熟悉缺口的基本含义、类型、特征及应用方法。