用于甲亢内科治疗的药物是

A．甲硫氧嘧啶
B．甲磺丁酰
C．¹³¹I
D．苯乙双胍
E．阿卡波糖

Though he was born of a rich family, Tom left home at the age of 15, ____ to make his own living.       

A．determining

B．determined

C．being determined

D．having determined