问题
选择题
They ______ the train until it disappeared in the distance.
A．saw
B．watched
C．noticed
D．observed
答案
答案：B
该句的意思是"他们目送这辆火车直到它消失在远方。"只有watch才能表达这个意思。
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They ______ the train until it disappeared in the distance.
A．saw
B．watched
C．noticed
D．observed
答案：B
该句的意思是"他们目送这辆火车直到它消失在远方。"只有watch才能表达这个意思。