— Hurry up! Alice and Sue are waiting for you at the school gate.

— Oh! I thought they ________ without me.  [ ]

A. went            

B. had gone          

C. have gone          

D. are going

工作人员撤离电缆井或隧道后，应立即（）

A、加装红灯

B、留人看守

C、将井盖盖好