Bob with us together since he came to our school.
A. have worked
B. has worked
C. worked
D. will work
网友回答
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。