You can’t catch up with others         you work hard.
A．untilB．a(chǎn)fterC．unlessD．When
C

試題分析：
句意：除非你努力，否則你不可能趕上別人。 until直到---才---， after 在---之后，unless 除非，When當(dāng)---時候。根據(jù)句意，應(yīng)選用表示讓步的連詞unless。
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