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whereisyoursister,Danny?Shemustbeinthepark.Sheusually()adodhereatthistimeofday.A.walksB.walkedC.willwalkD.haswalked请问如何选择,理由是?

题目详情
where is your sister ,Danny?She must be in the park.She usually( )a dod here at this time of day.
A.walks B.walked C.will walk D.has walked请问如何选择,理由是?
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答案和解析
A 因为有个usually,所以用一般现在时,表示一种通常的状态.