Gaokao Math Practice Question
3. (5 分) 下列各式的运算结果为纯虚数的是（ ）
- A.$i(1+i)^{2}$
- B.$i^{2}(1-i)$
- C.$(1+\mathrm{i})^{2}$
- D.$i(1+i)$
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