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【单选题】
已知R2=0x100, 内存0xff处存放0x80,0x100处存放0x90,0x101处存放0xa0, 执行指令"LDRB R3,[R2],#-1"后,寄存器R3和R2的值为( )A.
R3=0x90， R2=0x100
B.
R3=0x80， R2=0xff
C.
R3=0xa0， R2=0x100
D.
R3=0x90， R2=0xff
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