Question

【题目】While John ________ the museum , he saw his classmate.

A. is visiting B. visited C. was visiting

Answer 1

【答案】C

【解析】句意：当约翰参观博物馆时候，他看见了他的同学。While引导的时间状语从句用进行时，根据主语谓语saw可知此处用过去进行时，故选C。