把一个句子改成同义句.There were many green trees in this area in the past.There __ __ __many green trees in this area in the past.

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把一个句子改成同义句.There were many green trees in this area in the past.There __ __ __many green trees in this area in the past.

把一个句子改成同义句.There were many green trees in this area in the past.There __ __ __many green trees in this area in the past.
把一个句子改成同义句.
There were many green trees in this area in the past.
There __ __ __many green trees in this area in the past.

把一个句子改成同义句.There were many green trees in this area in the past.There __ __ __many green trees in this area in the past.
used to be

were lots of

used to be

2楼的答案是对的.

used to be