--Is everything __ we need to do __?

--Yes. You needn’t worry about it.

A．which; has done

B．which; doing

C．that; has done

D．that; done

下列哪项检查对食管异物的确诊最重要？（）

A.误吞异物病史

B.间接喉镜检查

C.纤维喉镜检查

D.食管镜检查

E.X线摄片