susan stays alone in the classroom and looks sad.what () to her?只有过去式和现在完成,应该选哪个?

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susan stays alone in the classroom and looks sad.what () to her?只有过去式和现在完成,应该选哪个?

具体选项是?

过去时 如 happened

过去式

过去式

happened

一定过去式

What happened to her