Question

The stadium ________ at present in Beijing is for the 2008 Olympic Games．

1. A.
   built
2. B.
   to build
3. C.
   to be built
4. D.
   being built

Answer 1

D
现在分词短语being done做后置定语，表示动作正在进行。比较：
The meeting held yesterday(已经举行的)is about terrorism．
The meeting being held now(正在举行的)is about economy．
The meeting to be held tomorrow(将要举行的)is about Iraq．