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There ____ economies since the beginning of civilization, but as a field of study, economics ____ only recently.

A. have been / develops

B. are / has been developing     

C. have been / has developed

D. were / was developing     

I looked __________ for the book I lost.

A. all up

B. all over

C. all gone

D. all after

He didn’t study, ________ he failed the exam.

A. therefore

B. although

C. even though

D. as far as

Did you ________ tennis on Wednesday?

A. play

B. playd

C. played