The Sleep Smart Clock was invented by a group of students at Brown University in Rhode Island a friend complained of waking up tired and performing poorly on a test．( )A．onceB．afterC．unlessD．whil 题目和参考答案——青夏教育精英家教网—

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20．The Sleep Smart Clock was invented by a group of students at Brown University in Rhode Island _______ a friend complained of waking up tired and performing poorly on a test．（　　）

A．

once

B．

after

C．

unless

D．

while

分析在听到朋友抱怨早起醒来很累，测试成绩很差之后，睡眠智能时钟由一群来自罗德岛的布朗大学的学生发明出来了．

解答答案：B．根据 a friend complained of waking up tired and performing poorly on a test．可知睡眠智能时钟的发明灵感来自朋友的抱怨，应该是先有抱怨，然后才有这个发明，所以答案是B after"在…之后"，其他选项的含义分别是A"一旦"；C"除非"；D"当…时候"．

点评考查从属连词．after的例句：
1．After the pain of defeat passes，England have some thinking to do．失败的痛苦过去以后，英国人应该认真反思一下．
2．Hopefully，you won't have any problems after reading this．
希望你读完这个后就不会有任何问题了．
3．She travelled to India after taking her A levels．
她参加完高等程度考试后去印度旅行了．

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