Mr.White works for a chemical export-

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Mr.White works for a chemical export-
Mr Smith works with a chemical company,but he ______ for the industrial fair,since he is on leave.
A.has worked
B.works
C.has been working
D.is working

A
这里面现在完成时态.
意思是：史密斯先生在一家化工公司上班,但是自从他离开后,就一直在工业领域负责.
since为现在完成时态的标志性词,从过去某个时间点开始.
希望能够帮助到您
再问：答案不是。。
再答：那就是Ｃ，现在完成进行时。 since表示从过去某一时刻开始，一直持续到现在。现在完成进行时：过去的某一动作，一直持续到现在！

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