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—Susan married Jason last Sunday. 
—Really? How long _____ each other? No more than a week, I’m afraid.
  A. did they know           B. have they known   
C. have they got to know      D. had they known

—Susan married Jason last Sunday.

—Really? How long ________ each other? No more than a week, I'm afraid.

[　　]

—Susan married Jason last Sunday．

—Really? How long _____ each other? No more than a week, I’m afraid．

A．did they know                                               B．have they known

C．have they got to know                             D．had they known

—Susan married Jason last Sunday.

　 —Really ? How long _____ each other? No more than a week, I’m afraid.

　 A. did they know　　 　　　　 B. have they known　

　 C. have they got to know　　 D. had they known