If there no water or air on the earth all living things would die.A. isB. wereC. areD.

问题补充：

If there no water or air on the earth, all living things would die.

A. is

B. were

C. are

D. will be

答案：

A. is

(答案→)B. were

C. are

D. will be

解析：可联系答案网客服索取此答案。