They also helped build the vast network of railroads that ____ important trade centers essential to industrial grented.
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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答案解析107The utility of network-based schedules: A.Reveals
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