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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