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一 When did your cousin begin to show his interest in medicine?
一 It was a Saturday _____ she noticed her uncle experimenting on a frog in his lab.

A. that
B. what
C. when
D. which
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科目：高中英語 來源：安徽省模擬題 題型：單選題

一 When did your cousin begin to show his interest in medicine?
一 It was a Saturday _____ she noticed her uncle experimenting on a frog in his lab.
[     ]
A. that
B. what
C. when
D. which

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