The boy _____ is playing the piano is a friend of mine. [ ]
The boy _____ is playing the piano is a friend of mine. [ ]
A. whose B. who C. whom D. which
可能相似的问题
你能帮帮他们吗
The boy _____ is playing the piano is a friend of mine. [ ]
A. whose B. who C. whom D. which
你能帮帮他们吗