1Itisvery的精选

问题详情：词汇根据句意和汉语提示写出单词，完成句子。1.Itisvery__________(有意义的)forustojointheTree-plantingClub.2.Itis_________(必须的)forustoknowhowtowriteareport.3.Weshouldknowthe_________(背景)ofthee...