12. Mr. White works with an import and export company but he for this industrial fair s

问题补充：

12. Mr. White works with an import and export company, but he for this industrial fair, since he is on leave.

A. has worked

B. works

C. has been working

D. is working

答案：

A. has worked

B. works

C. has been working

(答案→)D. is working

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