第1个回答 2012-04-07
It took me two and a half hours to finish the homework.
第2个回答 2012-04-07
It takes me 2.5 hours to finish the homework.
第3个回答 2012-04-07
I finally finished my homework after two and a half hours .
第4个回答 2012-04-07
it takes me two hours to finish my homework