Work hard at your lessons, ______ you’ll fail the exams again.
A．a(chǎn)ndB．butC．orD．which
C

試題分析：考查固定句型：祈使句+and/or+簡單句，句意：努力學(xué)習(xí)，否則你又會不及格了。選C。
點評：固定句型：祈使句+and/or+簡單句，是高考的常考點，這個句型還可以變成：名詞+and/or+簡單句。
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