Question

With the old stone bridge ________, a new steel one is being built in its place．

1. A.
   torn down
2. B.
   being torn down
3. C.
   tearing down
4. D.
   has been torn down

Answer 1

A
考查with复合结构。句意是“旧的石桥被拆了，在它的原址上正在修建一座新的钢桥。”石桥是“被拆”了，所以用tear的过去分词形式。