选择题：20.Immediately afterwards, the area was searched _

题目内容：
20.Immediately afterwards, the area was searched _______. (Rajiv Gandhi Escapes an Assassination Attempt)
A)and the security men caught the assailant
B)but security men failed to spot the gunman
C)and the gunman surrendered himself
D)but the gunman escaped undetected
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28. The Pentagon’s reaction is based on _______. (

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如图 a 所示，在物体上作用有两力偶ex_1258954967723_0.jpg 和ex_12589

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关于隔离消毒原则下列说法错误的是：（ ）

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Americans and 36 Chinese of mixed heights are the

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