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Petertriedtocrosstheborderthreemoretimes

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问题详情:

Petertriedtocrosstheborderthreemoretimes

Peter tried to cross the border three more times _____ he finally succeeded.  

A. when              B. as                    C. after               D. before

【回答】

D

知识点:连词

题型:选择题

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