It is exactly its great success in rural reforms ______ prompted the country to make a bigger leap forward in the reform and opening-up drive.A.whereB.whatC.thatD.when
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C解析It is …that…构成强调句，对主语部分exactly its great success in rural reforms进行强调。句意为：确切地说，是农村改革的伟大成功使国家的改革开放向前迈了更大的一步。