contribute to这个词组里面to是介词,我们知道介词后面只能接名词、动名词或者名词短语,而这里的wash是动词,如果要放在介词to后面就要改成动名词,并且这里时表示被动关系,因此应该填being washed away.
非谓语动词的.In recent years ,a lot of trees have been cut down ,w
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