现已探明我国南海海底深处蕴藏着一种固体--“可燃冰”，其化学成分是甲烷水合物（CH₄·8H₂O）。下列叙述不正确的是[ ]

A.可燃冰由碳、氢、氧三种元素组成

B.可燃冰燃烧后的生成物是二氧化碳和水

C.可燃冰分子中碳、氢、氧原子个数比为1:20:8

D.可燃冰分子中CH₄与H₂O的质量比为1:8

It was not until I was injured in a car accident ______ the real American society．

A．that I found out

B．when I found out

C．did I find out

D．that did I find out