题干
.
He wanted to know what I thought, _____ confused me because I thought the author knew
more than I did.
He wanted to know what I thought, _____ confused me because I thought the author knew
more than I did.
A：whe
B：that
C：which
D：where
答案(点此获取答案解析）
C
中，各项都是正数，且
，
，
成等差数列，则
的值为
