With more forests being destroyed in that area, huge quantities of land _______ deserts each year.

A．has been turned into

B．had been turned into

C．is being turned into

D．are being turned into

某工程组织等节奏流水施工，共有6个作业队，每队分5段施工，流水节拍为5天，其中第3、第5作业队分别间歇了2天、3天，则该工程的总工期应为( )天。

A．35
B．45
C．55
D．65