–Do you know Mr. Smith? –Yes, I ____him ...

–Do you know Mr. Smith?

–Yes, I ____him since 2008.

A.know B.knew C.have known D.will know

C 【解析】句意为：——你认识格林先生吗？——认识。2008年起我就认识他了。考查现在完成时的用法。since自从,since后的从句用一般过去时,主句用现在完成时。根据语境可知，这里表示的是过去发生的动作对现在造成的影响或结果，时态应用现在完成时。结合选项可知应选C。

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