题目列表(包括答案和解析)
When the bell rang announcing the end of class, students came out _____.
A. by twos and threes B. by two and three
C. by two and three D. by twos or threes
When the bell rang announcing the end of class, students came out ____.
A. by twos and threes B. by two and three
C. by two or three D. by twos or threes
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