Question

It was ___then that I realized the importance of a good mastery of the language.

A until B unless C not until D not less 要具体分析过程！

Answer 1

C not until then直到那时我才意识到学好这门语言的重要性！这是一个强调句！把It was that去掉就好看了！

Answer 2

这么强悍我英语很垃圾额