他注意到自己在街上散步时被一个陌生人跟踪着。（过去进行时）
He noticed that he
was being followed by a stranger
was being followed by a stranger
when he was walking in the street.

【答案】was being followed by a stranger

【解答】

【点评】

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发布：2024/5/27 14:0:0组卷：3引用：1难度：0.8

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他注意到自己在街上散步时被一个陌生人跟踪着。（过去进行时）He noticed that he was being followed by a strangerwas being followed by a stranger when he was walking in the street.