1)Mr.Smith is one of the foreign experts who ____ in China.
A.works B.is working C.are working D.has been working
2)I'll tell you ____ he told me last week.
A.all which B.what all C.that all D.all
3)Wrestling is a sport ____ you try to get the other person down on the floor.
A.that B.where C.which D.in which
麻烦写出详细的原因,感激不尽!