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【題目】Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.

A. since B. after C. before D. When

【答案】C

【解析】

試題分析:考查連詞。句意:科學家說這種藥物在可以試驗在人類身上之前還有5或6年。 A. since既然;B. After之后;C. Before之前;D. When當...時;根據句意可知是能夠試驗之前還有5.6年,故選C項。

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