When the bell rang announcing the end of
题型:选择题
问题:
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
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