What has happened\happens to her?选择Susan stays alone in the classroom and looks sad.__________to her?A.What happensB.What has happenedA和B的区别是什么?为什么选B?

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What has happened\happens to her?选择Susan stays alone in the classroom and looks sad.__________to her?A.What happensB.What has happenedA和B的区别是什么?为什么选B?
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What has happened\happens to her?选择Susan stays alone in the classroom and looks sad.__________to her?A.What happensB.What has happenedA和B的区别是什么?为什么选B?
What has happened\happens to her?选择
Susan stays alone in the classroom and looks sad.
__________to her?
A.What happens
B.What has happened
A和B的区别是什么?为什么选B?

What has happened\happens to her?选择Susan stays alone in the classroom and looks sad.__________to her?A.What happensB.What has happenedA和B的区别是什么?为什么选B?
根据前文我们知道句子的时态是一般现在时,根据前文Susan呆呆的呆在教室独自伤心,那我们知道应该是在她身上发生了某些事情,而这些事情对她是有影响的（使得她伤心,发呆）,所以用完成时,表示过去的动作对现在造成影响.A的话就是说现在她发生了什么事情.（说得比较啰嗦,不知道看懂了吗）

B是现在完成时，这个时态表示过去发生的事对现在所造成的结果，她发生了什么使她看上去如此伤心呢？伤心是这个事件对她所造成的影响，所以选B

A是一般现在时，表示经常性动作
B是现在完成时，表示过去发生，但强调对现在的影响。
选项B表示她发生过什么事使她看上去伤心

A是现在完成时B是过去完成时。题意为她身上发生了什么。“发生了”是已经过去了的

what has happened?为什么用HAS what happened what has happenedwhat happened what has happened 在语义上有什么区别吗 What has happened和What was happened区别 what happened ?和what has happened ?的区别 what has happened.这个句式有错吗 what has happened是什么时态的句型 do you know what ( ) just now.A.was happened B.happened C.has happened D.has been happened 是what has happened to还是what has happened at快,还有后面加什么! what happened to you 和what has happened to you有什么区别 What has happened和What happened的区别另问过去时与现在完成时的区别 I wanted to know_to him.为什么填what happened而不是what has happened? what happened 和what has happened 有什么区别么请问 No matter what ( )happened to you.用have还是has what has happened to you这不是被动语态吗? What on earth has happened to make you so upset? what has happened to our weather?如题~ It tell us what has happened recently_____________________ 填单词 you can't change what has already happened是什么意思