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

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问题 Mr. White works with a chemicals import and 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 从句子中的连词“but”和“since”可知:but引导的分句表示正在发生的动作。要用一般进行时。D项正确。
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