---- air and water are very important for us.A.A B.An C.The D./

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----airandwaterareveryimportantforus.A.AB.AnC.TheD./----airandwaterareveryimportantforus.A.AB.AnC.Th

---- air and water are very important for us.A.A B.An C.The D./
---- air and water are very important for us.
A.A B.An C.The D./

---- air and water are very important for us.A.A B.An C.The D./
很明显,后面谓语动词用are,说明主语是空气和水这两样,且此处没有特指因此不需the,又是不可数名词,也不需定冠词a、an,因此不填

D
因为都是不可数名词
而且不需要特指
而由于主语有两个,因此谓语为复数。

D air和water均为不可数名词啊