I’ve been working for over twenty years and seldom so tired as now .A. I have felt B. I ha

问题补充：

I’ve been working for over twenty years and seldom so tired as now .

A. I have felt

B. I had felt

C. have I felt

D. had I felt

答案：

A. I have felt

B. I had felt

(答案→)C. have I felt

D. had I felt

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