They___the tram untik it disappeared in the distance.A.watchedB.observed

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They___the tram untik it disappeared in the distance.
A.watched
B.observed

watch 是看的意思 如看比赛,电视等 比see程度稍微强一点 但远不及observe observe 是仔细观察的意思 此处不适合

A

A
你打错一个字母,是until

a