【題目】You can't be successful _______ you keep working hard.

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

【答案】B

【解析】句意:除非你繼續(xù)努力,否則你不可能成功。A. if“如果”;B. unless“除非”;C. because“因為”;D. when“當(dāng)……的時候”。故選B。

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