He had collected plenty of historical evidence, proved that humans used to have different sleeping patterns.
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推荐题目
Do you remember those days we spent very happily along the seashore last summer?
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when
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where
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---Where did you save the drowning girl, ________ parents were both professors?---It was from the lake ______ she often went fishing.
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who; that
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whose; that
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whom; where
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whose; where
After living in New York for 30 years, he returned to his hometown ______he was brought up by his uncle.
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which
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Now there’s a system _________ the waste is disposed of using the principles of ecology.
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that
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where