No one can tell how many sufferings the kidnapped boy ________ when he was rescued yesterday.

A．had

B．has had

C．had had

D．would have

栓剂的全身作用包括（）.

A、释放、穿透、吸收

B、释放、吸收

C、扩散、吸收

D、释放、扩散、穿透、吸收