You can’t catch up with others         you work hard.

A．until B．a(chǎn)fter C．unless D．When

C

解析試題分析：
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(shí)候。根據(jù)句意，應(yīng)選用表示讓步的連詞unless。
考點(diǎn)：考查連詞辨析。

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