试题题干
As long as the balcony doors remained（）, it wasn't that big of an issue.
参考答案
正确答案：
试题解析
本句意为只要阳台门关着，就不是什么大事。remain是系动词，后面跟形容词做表语，四个选项中closed可作为形容词来做表语。
As long as the balcony doors remained（）, it wasn't that big of an issue.
本句意为只要阳台门关着，就不是什么大事。remain是系动词，后面跟形容词做表语，四个选项中closed可作为形容词来做表语。