【題目】You will never know the result ______ you try it by yourself.

A. when B. if C. unless D. after

【答案】C

【解析】

試題分析：根據(jù)句意，你永遠(yuǎn)不會知道結(jié)果，除非你親自嘗試。A. when當(dāng)……時候；B. if如果；C. unless除非；D. after在……之后。故選C。

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