若(a-2i)i=b-i，其中a，b∈R，i是虚数单位，则复数a+bi= [
| 若(a-2i)i=b-i，其中a，b∈R，i是虚数单位，则复数a+bi= |
| [ ] |
| A.1+2i B.-1+2i C.-1-2i D.1-2i |
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