Part 7:

Mark the letter A, B, C or D to indicate the correct answer to each of the following questions

Câu hỏi

I _ for my math textbook all day, but I _ it yet.

A. have been looking / haven't found

B. have looked / haven't found

C. have been looking / haven't been finding

D. have looked / haven't been finding

I ___________ for my math textbook all day, but I ___________ it yet.