— How long have you known John? — Since he to our class.A. has comeB. cameC. had comeD. c

问题补充：

— How long have you known John?

— Since he to our class.

A. has come

B. came

C. had come

D. comes

答案：

A. has come

(答案→)B. came

C. had come

D. comes

解析：考查时态。根据第一句中的have known说明是从过去某个时间到现在，故since后面使用过去时。句意：—你认识John多久时间了。—自从他来到我们班级。故B正确。