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

分析 我正要告訴你這個突如其來的變化，就在那時，一位不速之客來訪．

解答 答案：C because因為；before在前面；when當…時候；unless除非．題干中be about to表示正要干某事，常和when連用，when表示正在那時．故選C．

點評 本題考查從屬連詞when的特殊搭配．be about to do sth when…表示正要干某事，就在那時…

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