摘要：18．They the train until it disappeared in the distance． A．saw B．watched C．noticed D．observed
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They____ the train until it disappeared in the distance．
A．saw B．watched C．noticed D．observed
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They____ the train until it
disappeared in the distance．
A．saw B．watched C．noticed D．observed
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They ________ the train until it disappeared in the distance．
[ ]
A．saw
B．watched
C．noticed
D．observed