—My brother gets the first prize for computer in our city today.
—I am sure he            be a very smart student.
A．could
B．should
C．might
D．must
D
后句意思為“我敢說他肯定是一個(gè)相當(dāng)聰明的學(xué)生”，must在此處表示猜測(cè)。
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