Do you know ____Rome wasn’t built in a day means?
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答案A

考查宾语从句的用法.根据you konw 可知,后面的是宾语从句,从句中the old saying that Rome wasn't built in a day作means的主语,所以宾语从句中缺少means的宾语,故选择what.That Rome wasn't built in a day作the old saying 的同位语从句