题目内容
把下列各句改为被动句
They produce silk in Suzhou.
Silk _________ _________ in Suzhou.
We clean our classroom every day.
Our classroom _________ _________ every day.
They speak English in class.
English _________ _________ _________ _________ in class.
He teaches us ten words every class.
Ten words _________ _________ to us _________ _________ every class.
We use keys for opening the door.
Keys _________ _________ _________ opening the door.
