容易出现连接杆压迫黏膜的是（）

A.基托过薄

B.人工牙磨耗

C.模型不准确

D.开盒过早导致基托变形

E.人工牙盖嵴部蜡未去净

The big strike of the workers would _______ the production of cars for several months.  [    ]

A. hold down      

B. hold on          

C. hold with          

D. hold up