The fleet made several expeditions _______ the exploration was stopped.A．whenB．b
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The fleet made several expeditions _______ the exploration was stopped.| A．when | B．before | C．while | D．since |
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答案
| B |
解析
| 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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