Many people can't learn any lessons from the mistakes they've made _____ they get hurt somehow.
A．whetherB．unlessC．ifD．a(chǎn)s
B

試題分析：考查詞義辨析。A是否；B除非，如果…不；C如果；D當(dāng)…時；句意：很多人如果不受到傷害，就不能從他們所犯的錯誤中學(xué)習(xí)到教訓(xùn)。故B正確。
點評：連詞的詞義辨析要根據(jù)上下文的語境和語義辨析來教訓(xùn)，要特別注意一些形式相近的連詞，如unless, until等。
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