高中英语单选1 i do not know whether you happen___ but i am going t

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高中英语单选
1 i do not know whether you happen___ but i am going to study in theUSA this September
A to hear B to have heard
选 B 为什么?
2 ——are you going to leave our company?
___who ___ you?
A told B has told
选A 为什么,和上一题有什么不同吗?

1.B to have heard 是不定式的完成式,表示动作先发于do not know的动作；而to hear则不可.
2.who _told__ you?这句话中是对当时发生的事情的客观疑问,用一般现在时,当时的动作与现在无关,所以不能使用现在完成时的has told

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