I was about to inform you of the sudden change ______an unexpected visitor came.
A．becauseB．beforeC．whenD．unless
C

試題分析：固定句式：be about to do sth when…正要做某事在這時…；本句中的when是一個并列連詞，引導的是一個并列句，表示意料之外的發(fā)生的事情。句義：我正要通知你那一個突然的變化，在這時一名不速之客突然來訪。故C正確。
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