题目内容
4. —Why was he fined?
—He happened to (see) picking several flowers in the park.
4. be seen 此处happen to do sth意为"碰巧做某事",see sb doing sth变成被动语态为sb be seen doing sth.
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4. —Why was he fined?
—He happened to (see) picking several flowers in the park.
4. be seen 此处happen to do sth意为"碰巧做某事",see sb doing sth变成被动语态为sb be seen doing sth.