(2013·重庆模拟)—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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推荐题目
The following are some popular websites________people can sell goods to each other.
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where
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which
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when
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whose
I love animals and that’s the reason ______ I hate the people who kill wild animals for money.
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that
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in which
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which
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why
Today，we’ll discuss a number of cases ________ parents have much difficulty in communicating with their children.
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which
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why
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where
He had a lot of friends, only a few of ______ were invited to his wedding.
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whom
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them
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which
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who