You have failed two tests. You’d better start working harder, ____ you won’t pass the course.
A．a(chǎn)ndB．soC．butD．or
D
    
試題分析: 句意：——你已經(jīng)兩次考試不及格了。你最好現(xiàn)在開始努力，否則你這會(huì)掛科的。A并且；B所以；C但是；D否則。從句意可知此處指如果不努力將出現(xiàn)的結(jié)果，是對對方的警告，故答案選D。
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