i don't know whether you happened to have heard or i don't know whether you happened to hear?上面的两种说法那一个正确?

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• i don't know whether you happened to have heard or i don't know whether you happened to hear?
• I don't know whether you happen ____.A.to be heard B.to be hearing C.to hear D.to have heard
• i don't know whether you happened to have heard or i don't know whether you happened to hear?上面的两种说法那一个正确?
• 从方框中选择正确的词,并用其适当形式填空 （beyond .Dry ,find ,visit ,hear） No one（）any life从方框中选择正确的词,并用其适当形式填空（beyond .Dry ,find ,visit ,hear）1.No one（）any life on other planets so far 2.What happened was （）my control .So I don’t know what to do next3.A strange sound （）last night .It made us frightened (害怕的）4.Do you think Mars is a useful place（） fruit 5.Other planets may （）in the future
• 1.Why didn't you watch the show yesterday?Because i ____it before.A.had watched B.have watched c.had seen D.have seen2.Mary hasn't phone us yet.what____to her?A happens B has happened3.There is a crossing.We don't know_____A.where we would go B which street to turn to说下原因啊 正确答案是a b b 我主要不知道为什么 要写全些
• 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。
• I don't know whether you happen_____ but I'm going to study i n the US A.to have heard 为什么?
• 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?
• I don’t know whether you happen _____,but I am going to studyIn the USA this September.A.To be heard B.to be hearing C.to hear D.to have heard
• 英语表达正确的是.3.M:Did the airline agent think your passport was a fake?W:I don't know.________________________.A.I looked a hundred years old in that photo B.I didn't look my age in the photo C.I just told her my photo did not flat me at all 4.W:Wow!What happened?You look ___________________.M:You would too if you'd been through what I have.I've got jet lag.A.like something the cat dragged in B.really washed-out C.wear out 5.W:Take my advice.Go by boat.Arr
• 滑块以某一初速度冲上斜面做匀减速直线运动，到达斜面顶端时的速度为零.已知滑块通过斜面中点时的速度为v，则滑块在前一半路程中的平均速度大小为（　　）A. 2+12vB. （2+1）vC. 2vD. 12v
• 将Please refer to the instuction 译成中文