A. known B. idea C. feel A. but it may【T1】________like forever B. a person may have no【T2】________what is wrong C. what is【T3

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问题 A. known
B. idea
C. feel
A.  but it may【T1】________like forever
B.  a person may have no【T2】________what is wrong
C.  what is【T3】________as panic disorder
    A panic attack is a sudden feeling of terror. Usually it does not last long, 【T4】________The cause can be something as normally uneventful as driving over a bridge or flying in an airplane. And it can happen even if the person has driven over many bridges or flown many times before. A fast heartbeat. Sweaty hands. Difficulty breathing. A lightheaded feeling. At first【T5】________But these can all be signs of【T6】________The first appearance usually is between the ages ol eighteen and twenty-four. In some cases it develops after a tragedy, like the death of a loved one, or some other difficult situation.
【T3】

选项 A、 
B、 
C、 

答案A

解析 is的出现表示这里要用过去分词表示被动,所以选known,故选A。
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