【单选题】【消耗次数：1】
Never in my life ____ or seen such a thing.
①
I have heard of
②
I had heard of
③
have I heard of
④
did I hear of
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相关题目
【单选题】
12. That’s ______ joke I have ever heard.
①
the funniest
②
more funny
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a funniest
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funnier
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Tom, what did you do with my documents? I have never seen such a _______ and disorder!
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Tom, what did you do with my documents? I have never seen such a____ and disorder!
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34.I heard that you really had a wonderful time at Johns birthday party, _____?
①
didntI
②
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But the houses were cold, closed,______, and I ran on until I heard Jeremys screams behind me announcing that our attackers had fled.
①
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③
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①
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②
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④
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①
chance
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【单选题】
I have lost my white hat. I______ it somewhere.
①
must be dropping
②
must have dropped
③
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④
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【单选题】
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①
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随机题目
【单选题】
有关帧的差错检测机制，说法不正确的是（）
①
帧的差错检测采用CRC检错技术
②
FCS是差错检测的冗余码
③
FCS可以通过数据除以特定的多项式得到
④
FCS只能通过CRC的方法得到