问题

eans much to me. It is _________ of my life _________ air, water and sunlight.
A:a part as much; as
B:so much a part; as
C:as a part much; as
D:as much a part; as;
B:so much a part; as
C:as a part much; as
D:as much a part; as;
正确答案是: