They_____the train until it disappeared in the distance.
A．sawB．watchedC．noticedD．observed
B
詞義辨析。  A. 看見   B. 觀看；監(jiān)視；注視  C. 注意到；留心   D. 觀察；注意到。句意：他們注視這火車，直到它消失在視野之中。故選B。
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