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
试题分析：be used to sth习惯于某事;used to do sth过去常常做某事.结合下文可知句意为：这条街两边过去常常有许多树。故选C。
考点：used to用法
点评：used to用法比较固定，需要注意use还可以作为被动语态使用，sth be used to do sth某物被用来做某事。