He failed the midterm examination and only then ________how much time he had was
题型：不详难度：来源：
He failed the midterm examination and only then ________how much time he had wasted. | A．he realized | B．did he realize | | C．he had realized | D．had he realized |
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答案
| B |
解析
| 本题考查动词的时态和倒装句的用法。根据语法要求only引导状语位于句首时，需要使用倒装句结构。而该状语only then表明了动作发生在过去。 |
举一反三
No sooner _________ to school _________ the bell for the first class began this morning.| A．had I got; when | B．I had got; than | | C．had I got; than | D．did I get; when |
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Only when he met the girl his aunt introduced to him ____ that he had seen her before.| A．he realized | B．he did realize | C．realized he | D．did he realize |
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I failed in the spoken examination last term and only then _______ the importance of practicing speaking English.| A．I had realized | B．had I realized | C．I did realize | D．did I realize |
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In no country other than Britain, it has been said, ________ experience four seasons in the course of a single day.| A．people can | B．you can | C．can it | D．can one |
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Only when I left my parents for Italy ________ how much I loved them.| A．I realize | B．I had realized | C．had I realized | D．did I realize |
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