请选择BA'U)^,k2d2h9T4V These ducks __________ very naughty.7x9M;G0Q.[)?6V+R;A5h7^)T(L,q(|
A. is7x9M;G0Q.[)?6V+R;A5h7^)T(L,q(|
B. are7x9M;G0Q.[)?6V+R;A5h7^)T(L,q(|