【題目】You won't catch the bus ______ you run.

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

【答案】D

【解析】

句意：除非你跑著去，否則你不會(huì)趕上公交車(chē)的。when當(dāng)…時(shí)候；if如果；while當(dāng)…時(shí)候；unless除非，如果不。根據(jù)句意可知，這里表示否定的假設(shè)，故應(yīng)選D。

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