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