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(gè)突如其來(lái)的變化，就在那時(shí)，一位不速之客來(lái)訪(fǎng)．

解答 答案：C because因?yàn)椋籦efore在前面；when當(dāng)…時(shí)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(shí)．故選C．

點(diǎn)評(píng) 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(shí)…

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