试题：
I was about to leave_______ something happened, which attracted my attention.
A．unlessB．untilC．whenD．while
从属连词, 并列连词 2016-05-28

答案：

我来补答
C

试题分析：句意：我正要离开，就在那时发生了一些事情，吸引了我的注意。Unless除非；until到……为止；when在那时；while然而。所以选C。
 
 
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