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Work hard at your lessons, ______ you’ll fail the exams again.
A．andB．butC．otherwiseD．besides
C

試題分析:考查連詞用法。A并且；B但是；C否則；D此外。從句意可知后句是一種警告，表示如果不努力，將要出現(xiàn)的結果。所以C選項正確。句意：努力學習你的功課，否則你會再次考不及格的。
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