Question

【题目】They have ________ since the factory opened.
A.left the school
B.joined the team
C.become workers
D.worked here

Answer 1

【答案】D
【解析】句意：自工厂开业他们就在这里工作。根据since the factory opened可知该用现在完成时态，而且谓语动词必须是延续性动词，所以选D。