题目内容
I had been looking for the book for two days _______ I found it at last.
| A． until | B． when | C． while | D．before |
D
解析试题分析：考查连词：A. until直到，B. when当…时候，C. while当…时候，虽然，然而，D. before在…前面，…才…，因为前面是过去完成式，所以是发生在过去的动作前的动作，句意：在我最后找到它之前，我已经找了这本书两天了。或是：我找了这本书两天才找到。选D。
考点：考查连词
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| A．so that | B．now that | C．for fear that | D．on condition that |
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| A．how | B．why | C．that | D．whether |
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| A．because | B．while | C．as | D．when |
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| A． why | B． how | C． because | D． whether |
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| A．that | B．even though | C．as | D．when |
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| A．when; that | B．while; which | C．when; which | D．while; that |
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| A．/; when | B．a; while | C．a; when | D．/; while |