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(shuō)正在發(fā)生的事情用現(xiàn)在進(jìn)行時(shí)am/is/are+doing，主語(yǔ)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(diǎn)評(píng) 在進(jìn)行時(shí)表示正在進(jìn)行的動(dòng)作或存在的狀態(tài)．現(xiàn)在進(jìn)行時(shí)表示動(dòng)作發(fā)生的時(shí)間是"現(xiàn)在"，動(dòng)作目前的狀態(tài)是"正在進(jìn)行中"

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