单项选择题

  John’s score on the test is the highest in the class. He ______.

A.should study
B.should have studied last night
C.must have studied last night
D.need study last night
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单项选择题
______, she led a life of complete seclusion.
A.Being disgraced
B.Disgraced
C.Disgracing
D.She was disgraced
单项选择题
The country’s chief exports are coal, cars and cotton goods, cars ______ the most important of these.
A.have been
B.are
C.being
D.are being
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