_____ the expense， I _____ to Italy.

A．If it were not， go

B．Were it not for， would go

C．Weren't it for， will go

D．If it hadn't been， would have gone

声环境评价等级为一级，噪声源噪声级数据获得的途径必须采用( )。

A．类比分析法
B．类比测量法
C．系统分析法
D．引用已有的数据