1.The country life he was used to_____greatly since 1992.

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1.The country life he was used to_____greatly since 1992.
A change B has changed C changing D have changed
2.The book was written in 1946,____the education system has witnessed great changes.
A when B during which C since then D since when

1.B
since：自...以后,自...以来(常用于现在完成时或过去完成时)
the country life 属于单数所以用 has changed
2.D
若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时,则从句表示的时间是“从那持续动作或状态结束时算起”.
前面用的是时间1946,所以用when 链接
两题都是since 的问题
附上since 的用法

1.The country life he was used to_____greatly since 1992. The country life he was used to_______greatly since the open The country life he was used to __greatly since 1992 the country life he was used to ----------greatly since 1992 The country life he was used to ( ) greatly since 1992.A.cha The country life he is used to _______ greatly since 1992. The country life he was used____greatly since 2004 A.change The life he was used to( has changed )greatly since 1992, The life he was used to has changed greatly since 1992 The life we were used to _____ greatly since 1992. Tom has lived in the country since he was 10 years old.改为否定句 The life he was used to ____ a lot in the last few yearsA.ha