(·重庆模拟)—When did your brother begin to show his interest in medicine? —It was a Satur

问题补充：

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

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

A. that

B. what

C. when

D. which

答案：

A. that

B. what

(答案→)C. when

D. which

解析：选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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