I was about to leave_______ something happened, which attracted my attention.
A．unlessB．untilC．whenD．while
C

試題分析：句意：我正要離開，就在那時(shí)發(fā)生了一些事情，吸引了我的注意。Unless除非；until到……為止；when在那時(shí)；while然而。所以選C。
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