It was during his stay in the countryside______________ he began to learn English.   
A.when
B.that
C.which
D.what
出自:国家开放大学英语语法

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块