George knew_________he could imp

George knew_________he could improve the way of marketing.
A、how that
B、which
C、how
D、how to
【正确答案】：C
【题目解析】：本题考查宾语从句。Knew是及物动词，所以其后面的句子是宾语从句，根据句意“应该是乔治知道如何改进营销方法”，所以选C. how。