Question

【题目】Yesterday I found a book in the bookstore (碰巧)which was intended for bird lovers.

Answer 1

【答案】by；chance/ accident
【解析】昨天我在书店发现一本书，碰巧这本书正是为爱鸟者所准备的，by accident和by chance表示碰巧之意。故填by accident或by chance。