表达式AT(IS THIS IS A BOOK)的运算结果是( )。 A..T.B.3C.1D.

表达式AT("IS"，"THIS IS A BOOK")的运算结果是（）。

A.．T．

B.3

C.1

D.出错

请帮忙给出正确答案和分析，谢谢！

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