下列哪一项是矫形鞋的基本作用

A．减轻疼痛

B．预防畸形的发展

C．消除关节活动

D．代偿丧失的关节功能

E．上述四项都对

Every time he tried to start the car, the wheels _____ deeper into the mud.

A．stayed

B．sank

C．fell

D．dropped