_____, the boy couldn"t enter his house.A．Since the key had lostB．The key being
题型：不详难度：来源：
_____, the boy couldn"t enter his house.| A．Since the key had lost | B．The key being lost | | C．Lost the key | D．Having lost the key |
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答案
| B |
解析
| 主语不同，分词构成独立主格。不选D, 因为句中强调的不是先后顺序，而是强调原因。 |
举一反三
The Arctic is considered _____ the northern part of the Atlantic.| A．having been | B．to have been | C．to be | D．being |
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I am too glad _____ you.| A．to see | B．seeing | C．saw | D．at seeing |
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There is _____ what the weather will be like.| A．not knowing | B．no knowing | C．not know | D．no known |
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_____, water can be changed into gas. | A．Heated | B．Being heated | | C．Having heated | D．Having been heated |
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_____ in the strange city, poor Bill fell to _____. | A．Lost; crying | B．Lost; cry | | C．To lose; cry | D．Having been lost; crying |
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