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Theytriedtofindout______thenewtrain________.A.howfar/hadgoneB.howlong/hasgoneC.howfar/wentD.howfarhad/run告诉我为什么
题目内容：
They tried to find out ______ the new train ________. A. how far/ had gone B. how long/ has gone C. how far/ went D. how far had/ run 告诉我为什么
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A. 主句用过去时,宾语从句里发生在主句动作之前,用过去完成时
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