I don't know whether you happen----,but I am going to study in the USAthis SeptemberA to be heard B to be hearing C to hear D to have heard

I don't know whether you happen----,but I am going to study in the USAthis SeptemberA to be heard B to be hearing C to hear D to have heard
I don't know whether you happen----,but I am going to study in the USAthis September
A to be heard B to be hearing C to hear D to have heard

I don't know whether you happen----,but I am going to study in the USAthis SeptemberA to be heard B to be hearing C to hear D to have heard
应该选C吧.翻译为“我不知道你是否听说过,但是我九月要去美国学习了.”
首先,sb happen to do sth表示某人碰巧做某事（主要表示是无意间做的事情）
A是不定式的被动态,因为不是被听说,所以不选.
B是不定式的进行时,因为也不是正在听说.不选
C.
D是不定式的完成形式,表示不定式的动作发生在谓语动作之前.这道题里谓语动词是happen 也就是“碰巧”,听说（hear）这个动作没有发生在这个动作之前,所以应该不选.

D。我不知道你是否已经碰巧听说过了，强调假设事件的已经完成，所以应该用完成时态。

选C：我不知道你是否恰巧听说（happen to hear)