The indoor swimming pool seems to be a great deal more lurious than is necessaryThe indoor swimming pool seems to be a great deal more lurious than (__)A,is necessary B.it is necessary为什么答案选A it为什么不需要啊?和下面这个例子

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TheindoorswimmingpoolseemstobeagreatdealmoreluriousthanisnecessaryTheindoorswimmingpoolseemstobeagre

The indoor swimming pool seems to be a great deal more lurious than is necessaryThe indoor swimming pool seems to be a great deal more lurious than (__)A,is necessary B.it is necessary为什么答案选A it为什么不需要啊?和下面这个例子
The indoor swimming pool seems to be a great deal more lurious than is necessary
The indoor swimming pool seems to be a great deal more lurious than (__)
A,is necessary
B.it is necessary
为什么答案选A it为什么不需要啊?
和下面这个例子有什么区别?
I got up earlier than I often do.这个句子后面还是需要主语 I

The indoor swimming pool seems to be a great deal more lurious than is necessaryThe indoor swimming pool seems to be a great deal more lurious than (__)A,is necessary B.it is necessary为什么答案选A it为什么不需要啊?和下面这个例子
lurious这个单词什么意思...应该是"奢侈的"那个单词luxurious
算了..可以忽略掉..
小朋友你语法没学好不是...
这里这个句子咧..
当比较状语无主语或宾语,连词相当于关系代词.你可以看看这些例子..
You spent more money than was intended to be spent.
你花的钱超过了预定的数额
(关系代词than 在从句中代替先行词money作主语).
There are very few but admire his talents.
很少有人不赞赏他的才干的.
(关系代词but 在从句中代替先行词few作主语,but=who don’t).
There is no one of us but wishes to go.
我们人人都想去.
（关系代词but 在从句中代替先行词one作主语,其意义相当于who not）
There is no one but likes money.
没人不喜欢钱.
（关系代词but 在从句中代替先行词one作主语,其意义相当于who not）
你所提到的这个句子就是没有宾语的情况了.其实你仔细分析一下就看出来了嘛.swimming pool是主语吧,seems是动词做谓语,连词相当于关系代词,所以就省略了it.
你举的这个例子肯定是不对的说.
没有i often do这个说法的啦.