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(2013·重庆模拟)—When did your brother begin to show his interest in medicine? —It was a Saturday he noti...
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
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