完成句子. There used to be some trees in the field, ?
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完成句子。
There used to be some trees in the field, ________?
试题答案
答案：
解析：didn't/usedn't/usen't there
完成句子。
There used to be some trees in the field, ________?
答案：
解析：didn't/usedn't/usen't there