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They __________ (debug) for two hours before they found the error.

A. debugged

B. had debugged

C. were debugging

D. had been debugging

Do you want to stop in this town, or shall we _______?

A. turn on

B. turn off

C. go on

D. look after

________ I use the computer?

A. May

B. Can

I usually__________for 6 hours a day, but I ___________for 8 hours yesterday.

A. work/worked

B. works/worked

C. worked/worked