英语Things are known ______ when they unite with the oxygen of

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英语Things are known ______ when they unite with the oxygen of the air.
A.to burn
B.burn
C.burning
D.being burning
为什么

答案是A.something is known to do something.是英语中常见的巨型,表示“大家都知道.”.这个句型可以改成：It is known that something ...
所以,这句话可以改成：It is known that things can burn when they unite with the oxygen of the air.
这句话的意思是：众所周知,当东西与空气中的氧混合在一起时,就可以燃烧.

英语Things are known ______ when they unite with the oxygen of Things are known _when they unite with the oxygen of the air the students shouted with ______ when they heard the ______ As is known,the oxygen we breathe in mixes with our blood an 英语翻译How old is old?When things are out of use they are quick to be content with things as they are; to take things as the They like the same things and they ____ ______ _____ with ea how are the things with With things as they are very good When we breathe,the oxygen in the air（） with our blood and g 1.If things are left ______ they are,the problems will never They are the _______ of the ______.描写狮子的