they______in this school since they ______to thicity in.2000A.have studied;have comeB.have studied;cameC.studied;cameD.were studying;have come

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they______in this school since they ______to thi
city in.2000
A.have studied;have come
B.have studied;came
C.studied;came
D.were studying;have come

现在完成时,过去时?B 对吗?