【題目】We should protect our eyes. Sometimes we don’t realize how important they are_____we become poor in eyesight.

A.unlessB.untilC.sinceD.after

【答案】B

【解析】

句意:我們應(yīng)該保護我們的眼睛。有時我們直到視力變差才意識到它們有多重要。

本題考查連詞。unless除非;until直到;since 自從;after在……以后。根據(jù)固定結(jié)構(gòu),not....until.... 直到……才……。結(jié)合句意可知,此空應(yīng)填until,故選B

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