—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.that | B.what | C.when | D.which |
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—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.that | B.what | C.when | D.which |