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

A. when B. if

C. unless D. after

 

C

【解析】

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

考點(diǎn)：考查連詞。

 

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