问题补充：
If there no water, there no life on the earth.
A. is, would be.
B. was, was.
C. were, would be.
D. were, would have.
答案：
A. is, would be.
B. was, was.
(答案→)C. were, would be.
D. were, would have.
解析：本题if后跟的条件从句是虚拟句，be在虚拟句中用were，本题的后半句意思为地球上将没有生命，是there be，故本题选C。
