-- Who do you think _____ such a foolish thing?

-- It _____ Tom, but I’m not sure.

A．could have done; may have been

B．could have done; must have been

C．should have done; may be

D．must have done; might have been

符合Graves病诊断的实验室检查结果是(↑表示升高，↓表示下降)

A．TT₃、TT₄↓
B．FT₃、FT₄↓
C．TSH受体抗体阴性
D．TSH↑
E．TRH兴奋试验阴性