I was speaking to Ann on the phone about our tour plan ______ suddenly we were c

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问题 I was speaking to Ann on the phone about our tour plan ______ suddenly we were cut off.

选项 A、that
B、while
C、before
D、when

答案 D

解析本题测试时间状语从句的引导词。根据句意，是表示某事发生的时候，某人正在做某事，故应选择when。that不能引导时间状语；while强调两个动作同时进行着，“一边……，一边……”；before在……之前。

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