Water which seems to be so simple and common is makes life possible.A. thatB. whichC. w

问题补充：

Water, which seems to be so simple and common, is makes life possible.

A. that

B. which

C. what

D. where

答案：

A. that

B. which

(答案→)C. what

D. where

解析：:what引导表语从句且作makes的主语。句意：水，看似简单普通却是使生命成为可能的东西。选C。