where is Helen?She _____America for a week.has gone off to,has left for,has been off to,has set off to 选哪一个?

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whereisHelen?She_____Americaforaweek.hasgoneoffto,hasleftfor,hasbeenoffto,hassetoffto选哪一个?whereisHel

where is Helen?She _____America for a week.has gone off to,has left for,has been off to,has set off to 选哪一个?
where is Helen?She _____America for a week.
has gone off to,has left for,has been off to,has set off to 选哪一个?

where is Helen?She _____America for a week.has gone off to,has left for,has been off to,has set off to 选哪一个?
选has been off to,因为后面说for…就表示一种状态,而离开是一个暂时的动作,只能用been来表示持续性的动作,意思是“她已经在美国离去的时候有了一个星期了”.

has set off to

has been off to