A.He was full of confidence at his success. B.He felt like a circus performer. C.He felt as if he had been performing all his life. D.He was determined to travel round the world.
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【单选题】C 语言中的标识符只能由字母、数字、下划线三种字符组成,且第一个字符( )。 ( A )必须是字母 ( B )必须是下划线 ( C )必须是字母或下划线 ( D )可以是字母、下划线和数字中的任一字符。