They      _ the train until it disappeared in the distance.
A．sawB．watchedC．noticedD．realized
B

試題分析：句意：他們看著火車(chē)直到它消失在遠(yuǎn)方。Saw看，看見(jiàn)；watched 觀看； noticed注意；realized意識(shí)到。所以選B。
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