函数y=sin(3x+π/3)的图像由y=sin3x的图像作出变化得到，则需

A.向左平移π/3 B.向右平移π/3 C.向左平移π/9 D.向右平移π/9

---

y=sin(3x+π/3)=sin3(x+π/9)]
选C

---