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I was about to tell him the secret    __someone patted me on the shoulder.
A.asB.untilC.whileD.when
D

试题分析:考查引导词,as意思“当…时候”,侧重指从句与主句的动作同时进行,谓语动词可以是持续的,也可以是短暂性动词;until 意思“直到…”,while意思“当…时候”,句中谓语动词是持续性动词,不用短暂性动词,谓语发生的时间通常与主句谓语动词动作发生时间是同时发生的;when意思“当…时候”,所引导的从句,其谓语动词既可以是持续性动词,也可以是短暂性动词,谓语动作发生的时间可以与主句谓语动作发生时间是同时,或之前、之后。
点评:引导词是常考内容,首先要知道引导词的意思,根据句子的意思选出正确的引导词
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