请选择ABCD7E3o)w5X:o(o,u5i4o0})F-x—_______________ does your father do?-~6^+{8P2t3p9U
— He’s an engineer.-~6^+{8P2t3p9U
A. Who-~6^+{8P2t3p9U
B. What-~6^+{8P2t3p9U
C. Which-~6^+{8P2t3p9U
D. How old-~6^+{8P2t3p9U