The River Nile ________ flood large areas, but now the water of it ________ produce electricity.
A.used to; is used to
B.was used to; is using to
C.was used to; is used to
D.used to; is used for
网友回答
A解析used to do…过去常常be used to do…被用来做某事；be used to doing…习惯于做某事be used for…被用于；被用作．