摘要：17．---Tom graduated from college at a very young age. ----Oh, he have been a very smart boy by then. A．could B．should C．might D．must

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—Tom graduated from college at a very young age.
—Oh,he__________have been a very smart boy then.

—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

—Tom graduated from college at a very young age.

—Oh, he ______ have been a very smart boy then.

A. would B. should C. must D. might

—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

—Tom graduated from college at a very young age.
—Oh,he__________have been a very smart boy then.

—Tom graduated from college at a very young age.—Oh,he__________have been a very smart boy then.