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GMAT Plus Book 1 Problem #98 [#permalink]
09 Dec 2004, 13:20
A pattern of accidents of personal problems and of low performance ratings for mechanical systems have marked the servicing and maintaining of the new power plant.
(A) have marked the servicing and maintaining
(B) have marked the servicing and maintenance
(C) have marked the service and maintenance
(D) has marked the service and maintaining
(E) has marked the servicing and maintenance