______ in the company for three years, Mark has become experienced in business negotiations.
A、
Having worked
B、
Have been worked
C、
Have worked
D、
Worked
【正确答案】
A
【答案解析】
考查动词时态。根据“for three years”和主句中的现在完成时态可以推知，此处应该用现在完成时的主动形式。故排除B和D。根据句意可知，空格处所在分句在句中作原因状语，故排除C。故选A。
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