Question

Mr. Smith has been to many famous cities in China, _______ Chengdu has impressed him most.

A．in which

B．on which

C．of which

D．with which

Answer 1

C

解析试题分析：考查介词前置的非限制性定语从句的用法，此处of意为：……之中的。Of  which相当于of many cities意为：在许多城市中。Of many famous cities in China，Chengdu has impressed him most.句意：史密斯先生到过中国的许多著名城市，其中成都给他的印象最深。
考点：考查定语从句的用法。