close down 可以當及物動詞，也可以當不及物動詞。
當及物動詞， close down ~ 是 「某方將某機關強迫關閉」，例如：
The authorities closed down the university for the second time this year.
For the second time this year the university was closed down (by the authorities) .
The shop closed down.
The shop was closed down by the police.
所以 The store closed down. 和 The store was closed down. 都可以，但語感可以明確知道歇業動機不同！