—Look!How long( )like this?—Three Weeks!It's usual here that

—Look!How long( )like this?—Three Weeks!It's usual here that rain( )without stopping(见下方)
during this time of the year
A.has it rained;pours B.has it been raining;pours C.is it raining;is pouring D.does it rain;pours
该题正确答案应选B,B选项has it been raining是被动语态吗?为什么不选A项?