（）---_______ontheriver?----T

请选择CBA2B:S'Y2?2_7h9K.B --- _______ on the river? ---- There’re some ducks.){4[8o,x:x'U'y

A. What){4[8o,x:x'U'y

B. Which){4[8o,x:x'U'y

C. What’s){4[8o,x:x'U'y