--- Bob where are you working now? --- I used to work in a small company but I a job in

问题补充：

--- Bob, where are you working now?

--- I used to work in a small company, but I a job in some bigger companies.

A. have sought

B. had sought

C. was seeking

D. am seeking

答案：

A. have sought

B. had sought

C. was seeking

(答案→)D. am seeking

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