—When did your brother begin to show his
题型:选择题
问题:
—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
—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