All the task _____ ahead of time, they decided to go on holiday for a week. [ ]

A. had been finished

B. were finished

C. having been finished

D. been finished

硅酮结构密封胶应根据不同的受力情况进行()验算。

A.承载力标准值

B.承载力设计值

C.承载力极限状态

D.承载力正常使用状态