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Susan stays alone in the classroom and looks sad.()to her?

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Susan stays alone in the classroom and looks sad.()to her?
A What happens?B What has happened?
C What is happening?D What was happening?
该选哪个啊,麻烦加以解释,
B.上句用的是一般现在时,"发生"了什么的动作发生在她看起来伤心之前,并造成了她现在她伤心的这种影响,所以选第二个.