氟尿嘧啶属于下列哪类抗肿瘤药物
A．生物碱类B．激素类C．烷化剂类D．抗代谢类E．抗生素类
参考答案：D
He was riding to school it began to rain.
A．as
B．so
C．while
D．when
监督权
