A nation’s merchant marine is made up of its commercial ships and people______them.

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问题 A nation’s merchant marine is made up of its commercial ships and people______them.

选项 A、they operate
B、who operate
C、they operate of
D、do they operate

答案B

解析该题是语法结构题，考查定语从句的用法。该定语从旬的先行名词是people，在定语从句中做主语。其他选项不能这样用。因此，根据题意和语法规则，选项B为最佳答案。

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专业英语四级

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