Tom ____(happen)to meet his class teacher when he was walking in the street.

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Tom____(happen)tomeethisclassteacherwhenhewaswalkinginthestreet.Tom____(happen)tomeethisclassteacher

Tom ____(happen)to meet his class teacher when he was walking in the street.
Tom ____(happen)to meet his class teacher when he was walking in the street.

Tom ____(happen)to meet his class teacher when he was walking in the street.
happened,后面是过去式