单项选择题

John D. Rockefeller,______, owned 90 percent of all American oil refineries.

A. as still a young man
B. while still a young man
C. a young man however
D. in spite of a young man
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It is up to the government to tackle the air pollution problem and ______ measures in line with the council's suggestions.
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Though ______ rich, he was better off than at any other period in his life.
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