他经常下课后帮老师擦黑板 英语这两句那个是对的 A:He often clean the blackboard for his teacher after classB:He often clean the blackboard after class for his teacher

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他经常下课后帮老师擦黑板英语这两句那个是对的A:HeoftencleantheblackboardforhisteacherafterclassB:Heoftencleantheblackboarda

他经常下课后帮老师擦黑板 英语这两句那个是对的 A:He often clean the blackboard for his teacher after classB:He often clean the blackboard after class for his teacher
他经常下课后帮老师擦黑板 英语这两句那个是对的
A:He often clean the blackboard for his teacher after class
B:He often clean the blackboard after class for his teacher

他经常下课后帮老师擦黑板 英语这两句那个是对的 A:He often clean the blackboard for his teacher after classB:He often clean the blackboard after class for his teacher
两个句子都对.其中A 较好.