Mr. White works for a chemical import-export company, but he ______ for this industrial fair, since he is on leave.[1997]
A、
has worked
B、
works
C、
has been working
D、
is working
【正确答案】
D
【答案解析】
解析：根据句意，用进行时表示暂时的动作，故选项D正确。
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