Convincing____this slogan was,in truth the shopper was cheated out of the crown.这里的空Convincing____this slogan was,in truth the shopper was cheated out of the crown.这里的空应该填什么呢,整个句子如何分析?

Convincing____this slogan was,in truth the shopper was cheated out of the crown.这里的空Convincing____this slogan was,in truth the shopper was cheated out of the crown.这里的空应该填什么呢,整个句子如何分析?
Convincing____this slogan was,in truth the shopper was cheated out of the crown.这里的空
Convincing____this slogan was,in truth the shopper was cheated out of the crown.这里的空应该填什么呢,整个句子如何分析?

Convincing____this slogan was,in truth the shopper was cheated out of the crown.这里的空Convincing____this slogan was,in truth the shopper was cheated out of the crown.这里的空应该填什么呢,整个句子如何分析?
填 as
主语
As convincing as this slogan was （省略 第一个 as ).
的意思是
Even though the slogan was convincing - 尽管标语看起来有说服力
整个句子
Convincing (as) this slogan was,in truth the shopper was cheated out of the crown.
是说
尽管标语看起来有说服力,实际上那个购物者被骗去了 crown .
我没有翻译 crown 是因为
crown 有几个不同意思：皇冠,荣誉,酬劳,首奖,等等
到底哪个意思要看上下文.

Convincing AS this slogan was,in truth the shopper was cheated out of the crown.
==THOUGH this slogan is quite concincing,in truth the shopper was cheated out of the crown.
表转折，是让步状语从句。