He always does his homework at eight.(always划线,提问)

He always does his homework at eight.(always划线,提问)

题目
He always does his homework at eight.(always划线,提问)
请帮我解答,而且说明为什么要这么做.
答案
How often does he do his homework at eight?
因为always表示频率,所以用how often 提问.does作为助动词,do 作为行为动词,所以这样说.
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