He found it impossible to please his boss; , he quit the well-paid job. A. however B. even

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A. however
B. even so
C. otherwise
(答案→)D. thus
解析：考查连词。A然而，可是；B虽然如此；C否则；D因此。句意：他发现让老板满意是不可能的；因此，他放弃了这份高工资的工作。根据句意说明D正确。