按法的动作结构是（）

A.术者取坐势或站势

B.不借助自身重力，仅用手或臂主动用力按压施术部位

C.用力平稳，由轻而重逐渐加力

D.待有得气感时，稍作停留

E.可用单指、单掌或双拇指、双掌重叠按压患处

There is some doubt ____ the sick schoolboy can join in the English evening party on Sunday.

A．/

B．whether

C．that

D．which