He turns deaf ear to his parents, many times they have pointed out his weaknesses.
A. whatever
B. whichever
C. whenever
D. however
网友回答
A. whatever
B. whichever
C. whenever
(答案→)D. however
解析：本题考查由however引导让步状语从句， however many times ：无论多少次。根据含义：无论多少次他们指出他的缺点，他对他的父母充耳不闻。故选D.