35.He __ to help me with my maths,but I refused his help ,as I'd decided to do it on my own.

问题描述:

35.He __ to help me with my maths,but I refused his help ,as I'd decided to do it on my own.
A.prepare
B.ready
C.insisted
D.offered
why

AB意思解释不通
offer to do sth主动提出做某事
D语法错误
insist on doing坚持做什么事