When the bell rang announcing the end of class, students came out______.

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问题 When the bell rang announcing the end of class, students came out______.

选项 A、by twos and threes
B、by two and three
C、by two or three
D、by twos or threes

答案A

解析 by/in twos and threes意为“三三两两地”,是固定短语。
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