UC知道改为同义句(八年级下）
来源：百度知道 编辑：UC知道 时间：2024/06/23 23:20:17
The factory ofen dumped its wast into this river in the past.
The factory ( ) ( ) ( ) ( ) waste into this river.
The factory ( ) ( ) ( ) ( ) waste into this river.
The factory (used) (to) (dump) (its)waste into this river.
used to表示“过去常常”，与“do...in the past"同义。
故这样写。
has been dumping its 现在完成进行时表示过去一直在干些什么事情
used to dump its
used to意为“过去常常（做）”
used to dump its
used to意为“过去常常（做）”