—Is there anything wrong with you Jake? You look so pale．—I feel very tired．I on this bor

问题补充：

—Is there anything wrong with you, Jake? You look so pale．

—I feel very tired．I on this boring paper every day so far this month．

A. work

B. have been working

C. had been working

D. am working

答案：

A. work

(答案→)B. have been working

C. had been working

D. am working

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