是has的缩写
is 不可能再与been连用的啊
has been是可以的啊,since...这种时间状语在,一般主句使用完成时,has been 就是完成时,表示自从她从非洲回来后这段时间里,她就变得有些不同
She's been quite different since coming back from America.
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