—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.
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A
that
B
what
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when
D
which
推荐题目
There was a tree in front of the house, ___ owner was seen sitting under it, enjoying the shade.
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whose
B
where
C
which
D
that
—Where did you get to know her? —It was on the farm _______ we worked.
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that
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there
C
which
D
where
We shouldn’t spend our money testing so many people, most of ___are healthy.
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A
whom
B
what
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which
D
that
He had collected plenty of historical evidence, proved that humans used to have different sleeping patterns.
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that
B
which
C
it
D
what