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
they ()the train until it disappeared in the distance.
A.saw B.watched C.noticed D.observed

they ()the train until it disappeared in the distance.A.saw B.watched C.noticed D.observed
B

B 注视、仔细地看
A 只表示一般的看
B 是注意到
D 是观察
所以只能选择B