—When did your cousin begin to show his interest in medicine?
—It was a Saturday ___ she noticed her uncle experimenting on a frog in his lab.
A．thatB．whatC．whenD．which
C
本題修飾名詞Saturday為定語從句，先行詞Saturday為時間，關(guān)系詞應(yīng)該用when，故本題C。
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