听力原文:W: Miho worked as an intern this summer, but she has managed to earn a lot. M: I'm not surprised at it, but I do doubt whether she knows when she has to come back to school. What does the man say about Miho?
【单选题】假设H是基本块出口的活跃变量, R0和R1是可用寄存器,对下列四元式组成基本块: A:=B*C D:=E+F G:=A+D H:=G*2 生成目标代码如下: LD R0, B MUL R0, C LD R1, E ADD R1, F ADD R0, R1 MUL R0, 2 ___________________ 其中空白处的代码为