—Dane hasn't arrived yet —? To my knowledge he is a punctual person．A. How comeB. So what

问题补充：

—Dane hasn arrived yet

—? To my knowledge, he is a punctual person．

A. How come

B. So what

C. What if

D. Why not

答案：

(答案→)A. How come

B. So what

C. What if

D. Why not

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