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 MothertoldJimtowatchthemilkuntilitboiledandthen

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问题详情:

 MothertoldJimtowatchthemilkuntilitboiledandthen

 Mother told Jim to watch the milk until it boiled and then _______ off the gas.

A. turn            B. turning        C. turned         D. having turned

【回答】

A

知识点:动词和动词短语

题型:选择题

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