We heard the birds singing tieir sweet songs on the trees 这句

We heard the birds singing tieir sweet songs on the trees 这句 There are some birds singing( )the trees What we want to see are the sweet singing of birds and free _____ the trees some birds are singing.A.On B.At C.In They a the birds are singing beautiful songs for them. The birds are singing in the trees.翻译 The songs of the birds in the tree sounded sweet,so iliked t the frresh air and sweet song of the birds.改错 song 改成了songs. we heard the news on the radio 变为否定句 The birds are singing in the trees and the fishes are s_____ The singer is singing some famous songs.（否定句） In spring,we can hear birds -----(sing) in the trees