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
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题目内容：
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
本题链接：
