You can’t get good grades______ you study hard.
A．whenB．becauseC．unlessD．that
C

試題分析：句意：如果你不努力學習，你就不能獲得好成績。A. when 當......時候；引導時間狀語從句。   B. because 因為，引導原因狀語從句； C. unless 除非，如果....不，引導條件狀語從句；   D. that 那個。只是以引導詞。you study hard.是You can’t get good grades的條件，故用來連詞 unless。故選C。
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