请选择ABC7I9R-q'Q-E4n-U*k/S({)N2J6u)j Do you know which is ______ river in the world?1@(?8V7k/Z+T7?*Q0a*j)Q4z*h,m(H5c
A.the long1@(?8V7k/Z+T7?*Q0a*j)Q4z*h,m(H5c
B.the longer1@(?8V7k/Z+T7?*Q0a*j)Q4z*h,m(H5c
C.the longest1@(?8V7k/Z+T7?*Q0a*j)Q4z*h,m(H5c