Question

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

A．used to have

B．are used to be

C．used to be

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。
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。