if not better 用法是什么?John plays football___,if not better than,David.A.as well B.as well as C.so well D.so well as答案选的是B这里的if not better than 用了两个逗号隔开,可以当作插入语吗?

if not better than表示即使不比...好，是插入的成分。

逗号隔开的成分是插入语！插入成分可去掉，本句意为John plays football as well as David！

这是一个省略句, 句中的 if not better than＝if he doesn't play football better than.全句意为：吉姆踢足球如果不是比迈克踢得更好, 至少也是一样好.请做以下类似试题 (答案均选D)：
(1) Her pronunciation is _____, if not better than, her teacher's.
A. as well B. as well as C. as good D. as good as
(2) This bridge is _____, if not stronger than, that one.
A. so strong B. as strong C. so strong as D. as strong as
(3) He has been to Paris_____, if not more than, ten times.
A. so much B. so many C. so much D. as many as

就是说
如果JOHN不比DAVID踢球好的话
至少也跟他不相上下