你好,这道题的正确答案是：
你说得对,这是一个错句.
因为主语是My sister,为第三人称单数,
on Sundays,在周日,所以时态为一般现在时
因此clean应该加上s
这句话翻译为：
我姐姐经常在周日帮我父母打扫房间.
My sister often clean rooms to help my parents on Sundays .为
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