柔性饰面砖施工前应对柔性饰面砖、粘结剂、（）材料进行进场验收。

In many parts of the world, man has not realized the importance of the role of trees. He has cut them down in large numbers () that without them he has lost the best friends he had.

A. then found

B. only to find

C. but found

D. therefore found