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They ______ the train until it disappeared in the distance.


  1. A.
    saw
  2. B.
    found
  3. C.
    noticed
  4. D.
    observed
D
考察动词。Saw 看到 found 发现 notice注意到 observe观察,
句意为,他们观察这辆火车知道它消失在远方。
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