The instructor had gone over the problems many times before the students( )the final examination.

A. locked B. are loked

C. will locked D. lock

A. locked B. are loked

C. will locked D. lock

A. would review B. shall review

C. shall have reviewed D. shall be reviewing

A. met B. have met

C. had met D. had been meeting

A. met B. have met

C. had met D. had been meeting

A. will graduate B. will be graduating

C. will be graduated D. will have graduated

A. was talking B. talked

C. would talk D. had been talking

A. did you do B. have you been doing

C. have made D. were you doing

A. was looking forward to B. have been looking forward to

C. had been looking forward to D. looked forward to

A. have you arrested B. will have you arrested

C. must have you arrested D. have you arrest