The old school ＿＿＿(pull)down.A new school is being built.
问题描述：
The old school ＿＿＿(pull)down.A new school is being built.
为什么has been pulled
答
has been pulled
pull down 拆毁
是个及物动词,主语是老学校,谓语是拆毁,一看就知道是被动关系,所以用被动语态
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