how long ( )my mother stayed in hospital last month?括号内填did还是was

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how long ( )my mother stayed in hospital last month?括号内填did还是was
how long ( )my mother stayed in hospital last month?
括号内填did还是was

how long ( )my mother stayed in hospital last month?括号内填did还是was
was是系动词is的过去时态,系动词本身是动词后面不可再跟动词.系表结构,乃系动词后面加表语,比如形容词作表语.
该句的动词是stay,所以要用助词do的过去式did.另外纠正一下,应该是How long (did)my mother stay in hospital last month?