用所给动词的适当形式填空Scientists_______only now_______(begin)to unders
用所给动词的适当形式填空
Scientists_______only now_______(begin)to understand them.
In the last 200 years,more than half of all tress_______(destroy).
Scientists_______only now_______(begin)to understand them.
In the last 200 years,more than half of all tress_______(destroy).
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你能帮帮他们吗