I can never forget the summer _____ we had the big drought in our country.
A.which
B.why
C.where
D.when
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