The cases should be ( ) they can easily be made tightly closed again after being opened.
A.as such so as
B.of such a type that
C.like this so that
D.of such a type which
出自:国家开放大学国际航运英语与函电

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