--What did the professor ask us to do just now?　　Sorry I about my trip to the Wolf Hi

问题补充：

--What did the professor ask us to do just now?

--Sorry, I about my trip to the Wolf Hill at the weekend.

A. had thought

B. was thinking

C. thought

D. think

答案：

A. had thought

(答案→)B. was thinking

C. thought

D. think

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