Repairing this car took him the whole afternoon.的时态,repair为什么加ing

问题描述:

Repairing this car took him the whole afternoon.的时态,repair为什么加ing
或 = It took him the whole afternoon repairing this car.为什么省略t0

原句是动名词作主语.
等于的句子是有问题的,应把repairing----to repair