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高中英语语法题_____ his own boss for such a long time ,he found it

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高中英语语法题
_____ his own boss for such a long time ,he found it hard to accept orders from another .
A Being
B To be
C Having been
D Been
应该选择C.
很明显,这儿有先后关系,再者有for such a long time这种明显的时间状语,所以应该用完成时.所以应该是C