问题
选择题
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
答案
答案：A
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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
答案：A