—It seems that you know Dr. John very well.

—Of course, we ________ together for five years in the 1990s.

A．have worked B．had worked

C．are working D．worked

 

D

【解析】答案：D　考查時(shí)態(tài)。一般過去時(shí)陳述過去的事實(shí)。

 

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