— She looks rather upset. She        the exam.
— I guess so. It’s very difficult after all.
A．must have failedB．can fail
C．would have failedD．should fail
A               
             
試題分析：考查情態(tài)動詞。句意 她看起來相當(dāng)沮喪，肯定是考試不及格。我猜是，比較考試太難了。根據(jù)上文提到 She looks rather upset 現(xiàn)在看起來沮喪，下文表示對過去的肯定推測must have done ,所以選A項(xiàng)。        
考點(diǎn) : 考查情態(tài)動詞
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