A-A+
In the United States a primary election is a
问题详情
In the United States, a primary election is a method ______ voters select the nominees for public office.
A．that
B．is that
C．by which
D．by those
参考答案
正确答案：C
解析：句子结构题。根据句子结构，先行词是method时，后面只能用by which来引导定语从句，表示“通过……方式”。故C为正确答案。
