—Why does the lake smell terrible?

—Because large quantities of water_________.   [ ]

A. have polluted                

B. is being polluted

C. has been polluted            

D. have been polluted

版式设计的基本类型包含（）、中轴型、曲线型、倾斜型、对称型、重心型、三角型、并置型、自由型、四角型。

A.骨骼型

B.满版型

C.上下分割型

D.左右分割型

E.分散型