题目内容
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.
一 It was a Saturday _____ she noticed her uncle experimenting on a frog in his lab.
[ ]
A. that
B. what
C. when
D. which
B. what
C. when
D. which
C
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