They also helped build the vast network of railroads that ____ important trad...

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问题 They also helped build the vast network of railroads that ____ important trade centers essential to industrial grented.

选项 A. had linked
B. link
C. Linking
D. linked

答案D

解析首先可判断出此句是关系代词that 引导的定语从句。先行词是network ofrailroads，从句中缺少谓语动词，故可排除C。根据主句的时态，应用一般过去时，故选D。

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