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

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

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