I don't know whether you happen ____.A.to be heard B.to be hearing C.to hear D.to have heard

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• i don't know whether you happened to have heard or i don't know whether you happened to hear?
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• I don't know whether you happen ____.A.to be heard B.to be hearing C.to hear D.to have heard
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• 7.I have no objection _______ your story again.A.to hear B.to hearing C.to having heard D.to have heard我选A22.If you really want to buy this brand of recorder,we have a few models _______.A.to choose from B.to be chosen C.to choose D.to choice我选C
• He is often heard _______ the English song.A.to sing B.sing C.to have sung D.to be singing2.we don't know _____A.to do B.to be done C.what to do D.what to be doing我都知道答案,但是不明白这是什么原理.只句的语感是这样.希望大家能说一下原因.
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• don't know whether you happen_____,but i am going to study in u.s.a this September 为什么选to hear 不选 to be heard 或者to have hearddon't know whether you happen_____,but i am going to study in u.s.a this September 这是道高考题，做过的请回答。干嘛我提问的英语问题总是没人能回答？风中冷月，为什么不用to have done 碰巧你已经听到了 不是更好？令hear 是及物动词吗？是为什么不能用被动。
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• I don't know whether you happen to have heard,but I'm going to study in the USA this September.我一直在纠结一个问题 为什么这里要说you happen to have heard 而不是 you have happened to hear?
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