患者，女，缺失，余留牙正常，可摘局部义齿修复，基牙，采用弯制卡环

基牙为三类导线，应采用哪类卡环（）

A．单臂卡环

B．双臂卡环

C．间隙卡环

D．上返卡环

E．下返卡环

.He, out of breath ,_____ himself along the street. Perhaps he was badly ill.

A．drew

B．pulled

C．dragged

D．pushed