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26．______life began on the earth is one of the biggest puzzles to scientists.
A．HowB．WhatC．WhereD．That
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28．How can they expect to learn anything________they never listen?
A．whenB．untilC．unlessD．Though

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科目：高中英語 來源：不詳 題型：單選題

_____ quite recently, most mothers in Britain did not take paid work outside the home.
A．Before B．Until C．From D．Since

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20. It was already 11 o’clock in the evening_____they arrived at the hotel.
A．whenB．before C．thatD．Since

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35. Everyone has periods in their lives ______ everything seems very hard.
A．whenB．whereC．whichD．That

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29．Don’t touch anything．Better leave things_________they are until the police arrive．
A．beforeB．thatC．a(chǎn)sD．While

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科目：高中英語 來源：不詳 題型：單選題

              
35．__ __ many Chinese women have received higher education, there are still obstacles that prevent them from enjoying the same opportunities for education and employment as men．          
A．WhetherB．BecauseC．WhenD．Although

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28．He spent much of the evening with Robert Green,____he had hardly seen in the thirty years since they had worked together at CBS.
A．what B．thatC．whoD．Whom

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科目：高中英語 來源：不詳 題型：單選題


28. You can’t complain of being lonely____you don’t make any effort to communicate with others.
A．whenB．until C．unlessD．Once

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