Irememberthere的精選

問題詳情：-Irememberthere_____alotoffishinYanglanLake．Nowithasbeenpolluted．-Whatapity!Ithinkweshouldplayaroleinprotectingtheenvironment．A．areusedtohave  B．areusedtobeC．usedtohave    D．usedtobe【回答】D知...