题目内容

— Tom graduated from college at a very young age. 
— Oh, he _____ have been a very smart boy then.
[     ]
A. could
B. should
C. might
D. must
D
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[     ]

A. shall
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[     ]

A. Must
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[     ]
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[     ]
A. may not be
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[     ]

A. may
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[     ]

A. may
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[     ]

A. couldn't
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[     ]
A. couldn't go
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