动词填空The bell for the class _______(ring) while they were working for the pupils.

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动词填空Thebellfortheclass_______(ring)whiletheywereworkingforthepupils.动词填空Thebellfortheclass_______(ri

动词填空The bell for the class _______(ring) while they were working for the pupils.
动词填空
The bell for the class _______(ring) while they were working for the pupils.

动词填空The bell for the class _______(ring) while they were working for the pupils.
rang,当他们为学生上课时,铃声响了,铃声响是短暂性的,所以应用过去式