It's a pity that too many trees______now.(cut down)why?

It's a pity that too many trees______now.(cut down)why?
It's a pity that too many trees______now.(cut down)
why?

It's a pity that too many trees______now.(cut down)why?
are being cut down(现代时被动语态）

are cut down，被动语态
真遗憾太多树被砍伐掉了

are being cut down
树是被砍伐所以用被动，后面又有now所以用进行时

are being cut down

are being cut down

are being cut down(现在时的被动语态am/is/are+being+现在分词）