Gaokao Math Practice Question
2. 设 $(1+2 \mathrm{i}) a+b=2 \mathrm{i}$, 其中 $a, b$ 为实数, 则（)
- A.$a=1, b=-1$
- B.$a=1, b=1$
- C.$a=-1, b=1$
- D.$a=-1, b=-1$
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