19．為了改善環(huán)境，我們正在通力合作．
In order to improve the environment，weare working together．

分析 are working together．

解答 答案：are working together．這里是說正在發(fā)生的事情用現(xiàn)在進行時am/is/are+doing，主語是we復(fù)數(shù)，故用are，通力合作也就是一起合作用work together，故答案是are working together．

點評 在進行時表示正在進行的動作或存在的狀態(tài)．現(xiàn)在進行時表示動作發(fā)生的時間是"現(xiàn)在"，動作目前的狀態(tài)是"正在進行中"

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