The policeman is investigating the______about the traffic accident.

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问题 The policeman is investigating the______about the traffic accident.

选项 A、passer-by
B、passers-by
C、passer-bys
D、passers-bys

答案B

解析 名词。有中心名词的合成词复数形式是将中心名词转变为复数形式。
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