yesterday he ___this for 20 dollars in the shop.可以用paid吗?为什么

yesterday he ___this for 20 dollars in the shop.可以用paid吗?为什么 He paid 10 dollars for the shirt 改为同义句 （）he bought in the shop yesterday? Linda paid 100 dollars for the bike He paid the boy 30 dollars for washing the window,most of __ John paid over 100000dollars for the car because he was grea John paid over 100,000 dollars for the car,because he was gr he paid the boy 10 dollars for washing ten windows,most of-- He paid the boy 10 dollars for washing ten windows ,most of_ he paid fifteen dollars for the lost book怎么改同义句 He paid the boy 10 dollars for washing ten windows,most of _ the coat,_____ i paid 40 dollars,was lost.答案为什么是which而不是for