英语高手请进1.---Do you know how many gold medals the 23-year-old

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英语高手请进
1.---Do you know how many gold medals the 23-year-old Micheal Phelps ----- at the 2008 Summer Olympic Games
-----Eight
A.win B.wins C.won d.has won
但为什么不能选A呢我认为过去式的话应该在DO上体现,所以选的A
2.---I'm afraid I can't return the book to you before Tuesday.
---________
A.Don't be afraid B.you are welcome
C.take your time D.be careful
正确答案是C 我选的是A.能不能将这四句的话意思翻译一下

1.因为问的是“你知道23岁的菲尔普斯在2008年北京夏季奥运会上获得了几枚金牌吗?”,这句动词是know,而后面的“how many……”是引导从句（省略了that）所以从句中仍用过去式.
2.A.别害怕 B.不用谢 C.（表示按你所要的时间,不必在礼拜二之前还书） D.小心点

英语高手请进1.---Do you know how many gold medals the 23-year-old Do you know how many gold medals China __-_(win)at the 2010 ---How many gold medals----the team -----? how many gold medals did china____at the 2010 winter olympic How many gold medals do the British sportsman win?把用错的单词找出来并 how many gold medals will be given to the best athletes? how many gold medals did china ____ at the 2010 winter olymp DO you know how many gold mcdals we got 汉语意思及回答英语高手快请进!Do you know the word _______ "f"?A.begin with B.begi 英语高手请进1.Do you like rainy days(= How do you feel on rainy da do you know how old she is 英语高手请进.But how do I face to the truth that you leave?是否有语法错误