Water is the most widely used resource i
问题:
Water is the most widely used resource in ______ industry, and plays ______ major role in energy production.
A.不填; a
B.the; a
C.an; 不填
D.an; the
Water is the most widely used resource in ______ industry, and plays ______ major role in energy production.
A.不填; a
B.the; a
C.an; 不填
D.an; the