—I knocked into a tree when I went to the railway station for my friends.        

—I suppose you _______ too fast.        [ ]

A. drive                                

B. are driving        

C. drove                              

D. were driving

甲状腺髓样癌

A．肿瘤形成 * * ，被覆上皮细胞核呈空泡状
B．肿瘤细胞形成滤泡
C．肿瘤细胞呈条索或片状排列，分泌降钙素
D．肿瘤细胞呈梭形
E．肿瘤细胞形成角化珠