--People find it hard to get across the river.

--I think at least two bridges ________ over it.

1. A.
   need
2. B.
   are needing
3. C.
   will need
4. D.
   are needed

(2007年武漢)

--- People find it hard to get across the river.

--- I think at least two bridges ________ over it.

[　　]

—People find it hard to get across the river．

—I think at least two bridges         over it．