Mr. White works with a chemicals import ＆ export company, but he_________for thi

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问题 Mr. White works with a chemicals import ＆ export company, but he_________for this industrial fair, since he is on leave.

选项 A、has worked
B、works
C、has been working
D、is working

答案 D

解析语法规则。之所以用D而不用C，因为句子中有since从句表示原因。

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