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

— How long have you known John?
— Since he to our class.
A. has come
B. came
C. had come
D. comes

A. has come(答案→)B. cameC. had comeD. 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。

这下我知道了