1、,栏目导航,A,A,C,A,C,A,B,A,C,D,It is a pleasure for me to help such a smart boy.,It is difficult to climb up that high mountain.,To ski on the mountain is interesting for us.,The boy is wise to solve the problem.,I spent about half an hour (in) tidying up my bedroom.,of,for,for,for,of,I dont know his dec
2、ision to study hard.或I have no idea about his decision to study,hard.,Its time to do eye exercises.,Its lucky to have a friend like you.,My dream is to fly to the Moon in the future.,Its dangerous for children to swim in the lake alone.,trying,a,be seen,until,suddenly,the happiest,on,you,worried,having,
