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问题: 我大约花了一个小时粉刷完这间房间.

It_me about two hours _finish painting the hours

解答:

It took me about two hours to _finish painting the hours
有个固定的句型
it takes sb. + time + to do sth.
其中it只是形式主语,to do sth.才是真正的主语
加上这里是花“了”1小时,所以是过去了,用一般过去时
和这个句型相等的句型有
spend ( time/money ) on sth.
spend ( time/money ) (in) doing sth.
pay ( time/money )for sth./doing sth.
sth costs sb.( time/money )
上面几个句型都是花费的意思
另外注意,括号里面的可以不要