题目内容

The fleet made several expeditions _______ the exploration was stopped.
A．whenB．beforeC．whileD．since
B
考查连词，A. when当…时候，B. before在…之前，翻译时可以做为：…才， C. while当…时候，然而D. since自从，句意是：船队进行了几次短途旅行之后，探险才结束。选B。
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