They were making a plan to help those students _____, which attracted me.

A．in brief

B．in public

C．in action

D．in need

一位年轻患者，义齿修复后3周，主诉义齿压痛。查：缺失，余留牙正常，义齿覆盖粘膜红肿、压痕。局部义齿均为双臂卡环，义齿贴合，固位尚可。

该患者出现粘膜压痛的原因是（）

A.基托翘动

B.义齿下沉

C.咬高

D.基托过小

E.基托不密合