A.not having studied | B.having studied | C.having not studied | D.not being studied |
A.to consider | B.to be considered | C.considering | D.of considering |
A.doing | B.have done | C.having done | D.being done |
A.work | B.works | C.worked | D.working |
A.repair | B.repairing | C.repaired | D.to repair |
A.know | B.knew | C.known | D.knowing |
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