问题
选择题
—What is the boy doing?
—It's not necessary for you to be ________ about others' business.
A．connected
B．combined
C．contributed
D．concerned
答案
答案：D
D [be concerned about ...为固定搭配，表示“关心……”。connect和combine意为“联系，结合”；contribute“贡献”。]