—It seems that you know Dr. John very well.
—Of course, we   ________     together for five years in the 1990s.
A．have workedB．had worked
C．a(chǎn)re workingD．worked
D
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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