Do you know ____Rome wasn’t built in a day means?A.what the old saying thatB.that the old saying thatC.that what the old sayingD.that what the old saying that
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A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'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