问题
选择题
I was about to leave_______ something happened, which attracted my attention.
A．unless
B．until
C．when
D．while
答案
答案：C
题目分析：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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