A.introduces | B.introduced | C.had introduced | D.was introducing |
A.has left | B.leaves | C.had left | D.was leaving |
A.are | B.is | C.has been | D.is to be |
A.finish | B.will finish | C.has finished | D.finished |
A.hadn’t seen | B.haven’t seen | C.didn’t see | D.don’t see |
A.would belong; heard | B.belonged; had heard |
C.was belonged; heard | D.was belonging; had heard |
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