问题补充：
Do you know Rome wasn’t built in a day means?
A. what the old saying that
B. that the old saying that
C. that what the old saying
D. that what the old saying that
答案：
(答案→)A. what the old saying that
B. that the old saying that
C. that what the old saying
D. that what the old saying that
解析：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 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 built in a day作the old saying 的同位语从句
