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

分析 我正要告诉你这个突如其来的变化,就在那时,一位不速之客来访.

解答 答案:C because因为;before在前面;when当…时候;unless除非.题干中be about to表示正要干某事,常和when连用,when表示正在那时.故选C.

点评 本题考查从属连词when的特殊搭配.be about to do sth when…表示正要干某事,就在那时…

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