( ) evidence that the puma at large has come from a private collector.

A.If being
B.It is
C.There is
D.There being
出自:当代英语语法概论

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