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

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。
點評：used to用法比較固定，需要注意use還可以作為被動語態使用，sth be used to do sth某物被用來做某事。