【題目】You will never be successful _____ you are fully devoted to you work.

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

【答案】B

【解析】

試題分析：句意：你永遠(yuǎn)不會(huì)成功除非你完全投入到你的工作中。A because因?yàn)椋?/span>B unless除非；C if 如果；D when當(dāng)……時(shí)候。故選B。

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