Sam is in Grade Three.Mary is in Grade Two.(合并成一句）Sam and Mary is in ___ ___.只有两空

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• Do you know the girl _____?A.whom he often talk to B.to who he often talks C.to that he ofDo you know the girl _____?　　A． whom he often talk to　　　B． to who he often talks　　C． to that he often talks　　 D． he often talks to为什么选D A错在哪里?