Question

If there ______ no water, there ______ no life on the earth

1. A.
   is, would be
2. B.
   was, was
3. C.
   were, would be
4. D.
   were, would have

Answer 1

C
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。