Question

So far this year, many new houses ________ in Wenchuan with the help of the government.

1. A.
   build
2. B.
   are built
3. C.
   will build
4. D.
   have been built

Answer 1

D
考查动词的时态。句中有So far“到目前为止”，使用现在完成时态，故选D。