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

2023-05-26

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

参考答案:D

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。

相关推荐