He often helps his classmates _____________ their English.[ ]

A. to

B. with

C. on

D. in

有关枢椎齿状突骨折的叙述不正确的是：

A．暴力强大，机制复杂

B．骨折容易愈合

C．但易致延髓损伤

D．以轻度瘫痪和神经痛最为常见

E．可发生呼吸骤停