--How long( ) the museum open a day?-- From 9:00a.m to 7:00 p.m是does还是is?谢啦,说一下理由.

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--How long( ) the museum open a day?-- From 9:00a.m to 7:00 p.m是does还是is?谢啦,说一下理由.

--How long( ) the museum open a day?-- From 9:00a.m to 7:00 p.m是does还是is?谢啦,说一下理由.
--How long( ) the museum open a day?-- From 9:00a.m to 7:00 p.m
是does还是is?谢啦,说一下理由.

--How long( ) the museum open a day?-- From 9:00a.m to 7:00 p.m是does还是is?谢啦,说一下理由.
is
is open 系表结构,表状态
这里指的是从早上9点,到晚上7点,一个时间段,可见,强调的不是动作,open 作动词时,是终止性的,不可以延续

does

does 因为open是一个动作 对应助动词does be是指一种状态通常与形容词连用