单选题 17.Living in the western part of the country has its problems, ______obtaining fresh water is not the least.

A、 with which
B、 for which
C、 of which
D、 which

【正确答案】 C

【答案解析】正确答案为C。从句的正常语序应为obtaining fresh water is not the least of which(ofits problems)。介词of表示“在……(同类人或物)中”，例如：He is the most diligent of theboys．他是男生中最勤奋的。