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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