The telephone _______, but by the time I got indoors, it sto

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The telephone _______, but by the time I got indoors, it stopped．
A． had rungB． was ringing
C． ringsD． has rung
我觉得选D 因为rung发生在stopped之前很明显啊为什么答案选B

B． was ringing一直响着.后面句子的意思是（转折）到我进来时为止,它才停下.
而现在完成时 D． has rung表示已经响过
再问：不要答非所问因为rung发生在stopped之前很明显啊为什么答案选B
再答： was ringing表示一直响着到我进来。注意by the time 表示过了一段时间后，为止
再问：啊！您就说rung是不是发生在stopped之前如果是为什么不用过去完成不用再说其他无关的谢~
再答：发生在stopped就用完成时吗？那可用过去完成时,就是不能用has rung现在完成时，即你可以用完成进行时had been ringring 再研究一下by the time 的意思！

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