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The teachers____(set) up a calling center for parents These

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The teachers____(set) up a calling center for parents These days,some people_____(put up)
The teachers____(set) up a calling center for parents
These days,some people_____(put up) ads here and there.
说明理由,
The teachers__set__(set) up a calling center for parents
教师们为家长成立一个呼叫中心.
就用一般过去式表示成立的事实.set过去式和原形一样.
These days,some people__put up___(put up) ads here and there.
现在有些人喜欢到处贴广告.
用一般现在时表达目前的状态.主语复数,所以就直接用put up