Before the operation, the doctor had to talk to the patient in order to move her fear ________ she might die during the operation.

A．when

B．that

C．which

D．so that

空气洁净设备中，组成高效过滤器送风口的是内装高效过滤器()。

A.保温箱体

B.接管

C.预过滤器

D.散扩孔板