Helen plays the violin , if not better than, Kate.
A. as well
B. so well
C. as well as
D. so well as
网友回答
A. as well
B. so well
(答案→)C. as well as
D. so well as
解析：考查短语。as well 也，同样的；so well如此好； as well as也，和……一样；so well as和……一样，只用于否定句。句意：海伦演奏小提琴，即使不比凯特更好，也和她差不多（一样）。if not better than是插入语。选C。