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问题: 英文小疑问.

They were often to be seen...与
They were often be seen...的区别是什么?
请言简意赅的说明,谢谢!

解答:

1)二个都是错句。
2)要表达“过去常常看到他们”,一般是“They were often seen”or “They used to be often seen”