Question

There ________ lots of trees on both sides of this street.But now they are all gone.

1. A.
   used to have
2. B.
   are used to be
3. C.
   used to be
4. D.
   are used to have

Answer 1

C
試題分析：be used to sth習慣于某事;used to do sth過去常常做某事.結合下文可知句意為：這條街兩邊過去常常有許多樹。故選C。
考點：used to用法
點評：used to用法比較固定，需要注意use還可以作為被動語態(tài)使用，sth be used to do sth某物被用來做某事。