问题补充：
Busy as Tom is, exercise has always beenhis work.
A. as a part of his life much as
B. as much a part of his life as
C. as much as a part of his life
D. so much a part of his life as
答案：
A. as a part of his life much as
(答案→)B. as much a part of his life as
C. as much as a part of his life
D. so much a part of his life as
解析：考查as…as…同级比较，句意：虽然Tom很忙，锻炼和工作一样是他生活的一部分。用到的结构是：as+adj+冠词+as，as much a part of his life as
选B
