what we thought as比较好的吧.
that的话就是to enjoy that most delicious dinner
通常来说两个都可以用,但碰到这样的情况试着把两个词代进去看哪个比较make sense..
比如说we like that cake
we like what is in the cake而不能说we like that is in the cake
we wish that her dreams can come true或者we wish what her dreams can come true
但意思就不太相同了.
啊,不太会解释额.抱歉,反正就是那个意思啦.
总之这里用that的话不通