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?

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?
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?

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