选择题：使用下列哪些关键字可以判定实参的具体类型？(A)as(B)is(C)instanceof(D)ext

题目内容：

使用下列哪些关键字可以判定实参的具体类型？
(A)as
(B)is
(C)instanceof
(D)extends

参考答案：

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