It could be one of the biggest environmental problems facing the 21st century.这里face为什么用ing形

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It could be one of the biggest environmental problems facing the 21st century.这里face为什么用ing形
It could be one of the biggest environmental problems facing the 21st century.这里face为什么用ing形

It could be one of the biggest environmental problems facing the 21st century.这里face为什么用ing形
face的用法.
1.sth face sb/sth某人某物面临的.事.
This is a really great trouble that faces us.如你的题,从句的改写,主动的谓语改成ING形式.
= This is a really great trouble facing us.
2.sb be faced with sth 某人面临某事.
Keep calm when you are faced with danger.

It could be one of the biggest environmental problems( that are) facing the 21st century.
可以这么理解。

前面有Be 动词,
在同一句话中后面的动词不能接动词原形,只能接现在分词(动词+ing),或者不定式(动词前+to)
face在这里是动词,面对的意思
全句意思是:面对21世纪,这可能会是最大的环境问题之一

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