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

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

选项 A、as still a young man
B、while still a young man
C、a young man however
D、in spite of a young man

答案B

解析 状语从句。此处应该是一个表示让步语气的状语从句,从句中省了主语和系动词,连接词应选择while。
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