题目内容

(2013·重庆模拟)—When did your brother begin to show his interest in medicine?

—It was a Saturday   he noticed his classmate experimenting on a frog in the lab.

A. thatB. what

C. whenD. which

 

C

【解析】C。考查定语从句。结合句意并分析句子结构可知, 此处使用when引导一个定语从句, when在从句中作状语。

 

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