Bob with us together since he came to our school.A. have workedB. has workedC. workedD. w

问题补充：

Bob with us together since he came to our school.

A. have worked

B. has worked

C. worked

D. will work

答案：

A. have worked

(答案→)B. has worked

C. worked

D. will work

解析：考查时态。本题的关键在于since(自从)；该连词一直都是与现在完成时连用的，表示从过去的某个时间开始到现在，所发生的事情。句意：自从他来到我们学校到现在，Bob一直都很我们在一起学习。故B正确。