题目内容
I was about to inform you of the sudden change ______an unexpected visitor came.
| A．because | B．before | C．when | D．unless |
C
解析试题分析：固定句式：be about to do sth when…正要做某事在这时…；本句中的when是一个并列连词，引导的是一个并列句，表示意料之外的发生的事情。句义：我正要通知你那一个突然的变化，在这时一名不速之客突然来访。故C正确。
考点：考察固定句式
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