They the train until it disappeared in the distance.A.sawB.foundC.noticedD.obser
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They ______ the train until it disappeared in the distance.
A.saw
B.found
C.noticed
D.observed
试题答案
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。