A.repair; to repair | B.repairing; to be repaired |
C.repaired; repair | D.to repair; repairing |
A.monitoring | B.being monitored | C.having monitored | D.monitored |
A.being proved to be of significance | B.was proved to be significance |
C.proving to be significant | D.proved to be significant |
A.to see | B.seen | C.to be seen | D.seeing |
A.leaving | B.not to leave | C.to be left | D.being left |
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