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The fleet made several expeditions _______ the exploration was stopped.
A．whenB．beforeC．whileD．since
B
考查連詞，A. when當…時候，B. before在…之前，翻譯時可以做為：…才， C. while當…時候，然而D. since自從，句意是：船隊進行了幾次短途旅行之后，探險才結束。選B。
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