she ____ (be) here since 1990.

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she ____ (be) here since 1990.

she ____ (be) here since 1990.
she ____ (be) here since 1990.

she ____ (be) here since 1990.
空中填has been
翻译是:她从1990年开始就一直在这儿了
since通常与现在完成时态连用

has been
祝你学习进步

She (has been) here since 1990. 这里since是"自从"的意思,通常与现在完成时搭配,因此须填has been.祝学习进步!