It has been increased by a factor of 4.为什么这句要使用现在完成时的“被动时态”?It has increased by three times as compared with that of 1998.而这句却是现在完成时的主动时态

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• It has been increased by a factor of 4.为什么这句要使用现在完成时的“被动时态”?
• It has been increased by a factor of 4.为什么这句要使用现在完成时的“被动时态”?It has increased by three times as compared with that of 1998.而这句却是现在完成时的主动时态
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