After living in America for over 20 years Brother Sway said to a reporter the other day

问题补充：

After living in America for over 20 years, Brother Sway said to a reporter the other day, “I done bigger things, had bigger achievements had I stayed in China.” .

A. must do

B. could do

C. could have done

D. must have done

答案：

A. must do

B. could do

(答案→)C. could have done

D. must have done

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