题目

I _______in London for many years，but I’ve never regretted my final decision to move back to China. A. lived   B. was living C. have lived       D. had lived 答案：A14．先化简，再求值：$\frac{{x}^{2}-1}{{x}^{2}+x}$÷（x-$\frac{2x-1}{x}$），其中x=$\sqrt{3}$+1．