We can’t pass the exam, ______ we study hard

A．because B．unless
C．though D．or

B

解析試題分析：句意：除非我們努力學(xué)習(xí)，否則我們不會通過考試。A. because因為；B. unless除非；C. though雖然；D.or或者，根據(jù)題干分析此處是“除非”的意思，故選B。
考點：考查連詞的用法

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