The key point is not who said the words, they are true or not.
A. but whether
B. and whether
C. but why
D. and how
网友回答
(答案→)A. but whether
B. and whether
C. but why
D. and how
解析：考查not----but不是---而是---固定搭配。此题涉及两个搭配：一是 not … but …（不是……而是……），二是 whether … or not （是否）。