Mr. White works with a chemicals import export company, but he for the industrial fair, since he is on leave.

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问题 Mr. White works with a chemicals import export company, but he for the 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 分析句子结构,根据since he is on leave的提示,说明是指他现在在做什么,强调节器的是现在,所以正确答案是D。
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