[单选题]He thought mattered most in improving your spoken English was enough confidence and practice.

A
Why
B
What
C
Which
D
That
正确答案:B
题目解析
考查宾语从句的连接词。此处what作宾语从句的主语。句意:他认为提高英语口语的关键是有足够的信心和练习。
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