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    We never know we will succeed ________ we actually try.

    A.until B.when C.unless D.though

    A

    解析試題分析:句意:直到我們真正的嘗試才知道是否會成功。never…until“知道……時候才”。 B. when“當……時候”;C. unless“除非”;D. though“盡管”,故選A。
    考點:考查連詞的辨析。

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