【題目】You should stick to taking exercise _____ you really do not care about your health.

A. sinceB. thoughC. untilD. unless

【答案】D

【解析】

句意:除非你真的不關(guān)心自己的健康,否則你應(yīng)該堅持鍛煉?疾檫B詞辨析。since自從,表時間;though盡管,表讓步;until直到,表時間;unless除非,表條件。本句是條件狀語從句,根據(jù)句意結(jié)構(gòu)和語境,可知選D

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