This is the most difficult book ______ .
A. what I have ever read B. which I have ever read
C.I have ever read it D. that I have ever read
出自:统招专升本-----英语

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