—Has Mr. Black decided not to take part in the party? —Yes. But the reasonhe refused the i

问题补充：

—Has Mr. Black decided not to take part in the party?

—Yes. But the reasonhe refused the invitation is not clear.

A. what

B. for which

C. with what

D. which

答案：

A. what

(答案→)B. for which

C. with what

D. which

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