题目内容

函数f(x)在点x=a处有定义是函数f(x)在点x=a处连续的

A. 必要不充分条件
B. 充分不必要条件
C. 充分必要条件
D. 既不充分也不必要条件

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1. There’s a man at the reception desk who seems very angry and I think he means______ trouble.

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