The Nile River ____ flood large areas but now the water ____ produce electricity.
A．used to; is used toB．used to; used to
C．was used to; is used toD．was used to; used to
A

試題分析：考查固定句型。句義：尼羅河過去常常淹沒大片地區(qū)但是現(xiàn)在被用來發(fā)電。固定句型used to do 過去常常（而現(xiàn)在不。。。） be used to do 被用來。。。，根據(jù)句意所以A正確。
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