第一个是B 第二个是D
第一道题的AC正确形式应该是
A.who had been to the USA in your class（时态一致）
C.when China became a number of the World Trade Organization（陈述句语序）
D搭配不当.
2.Is this village ____you visited with all your teachers and classmates last year?
这道题你可以先把它还原成陈述语序,就会明白了.
This village is _____ you visited with all your teachers and classmates last year.
这里要填在横线上的只能是代词 the one,后面的“you visited…”是修饰 the one 的定语从句.
补充一个非常有帮助的参考：
http://zhidao.baidu.com/question/50148786.html?fr=qrl&cid=85&index=1