Stella,you ________ always __________ (throw) things about.Look,what a mess in your room!答案是Stella,you are always throwing things about.Look,what a mess in your room!可是不能这样说吗?Stella,you shouldn't always throw things about.Look,w

Stella,you ________ always __________ (throw) things about.Look,what a mess in your room!答案是Stella,you are always throwing things about.Look,what a mess in your room!可是不能这样说吗?Stella,you shouldn't always throw things about.Look,w
Stella,you ________ always __________ (throw) things about.Look,what a mess in your room!
答案是Stella,you are always throwing things about.Look,what a mess in your room!
可是不能这样说吗?Stella,you shouldn't always throw things about.Look,what a mess in your room!

Stella,you ________ always __________ (throw) things about.Look,what a mess in your room!答案是Stella,you are always throwing things about.Look,what a mess in your room!可是不能这样说吗?Stella,you shouldn't always throw things about.Look,w
不可以
因为后有always,则表示总是,已经变成一种习惯了,而用shouldn't 的话,则表示可以偶尔乱仍一下,这个显然不对.
... are always throwing .表示总是,成了一种习惯,说明事情很严重,也含一种强调的意思.

可以这么说的，没什么毛病。
看例句：
5. Eg. Since everyone makes mistakes, you shouldn't always criticize him.
既然每个人都犯错误，你不应老是批评他。
www.pangyb.cn
6. I think you shouldn't always watch TV at home...

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可以这么说的，没什么毛病。
看例句：
5. Eg. Since everyone makes mistakes, you shouldn't always criticize him.
既然每个人都犯错误，你不应老是批评他。
www.pangyb.cn
6. I think you shouldn't always watch TV at home after supper and should often go out for a walk.
我认为晚饭后你不应该总在家里看电视，而应该常常出去散步。
blog.cersp.com
7. A: But they shouldn't always play the music so loudly, rock and roll,you know, even in the middle of the night!
但他们也不应该总把音乐声音开的那么大,还是摇滚乐,甚至在半夜也这样!
english.zgkqw.com
8. As you are no longer a child,you shouldn't always depend on your parents and you must learn how to look after yourself.
既然你已不再是小孩子，你就不应该总依赖你的父母，而要学会怎么自己照顾自己。
www.52webdiv.com
9. It's true he once deceived you, but he has admitted he has done wrong and apologized. So you shouldn't always treat him with suspicion.
诚然，他曾欺骗你，但他已经承认自己做错了，并道了歉。所以你不应该老是以怀疑的态度对待他。
这些句子和您给出的句子，没什么区别，如果说您给出的句子不对，容易理解为偶尔可以乱扔，那么我给出的这些例句是不是也可以理解为偶尔可以批评他，偶尔可以把声音放大，偶尔可以怀疑呢？

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不太对。因为后面有 always
not always 难道 Stella 不能总是 乱扔东西，就可以偶尔乱扔？ 所以不对。

按照您那样说的话，语法和意思都是正确的，
只是答案所用到的be doing有很强的感情色彩，犹如在责备：你怎么老是乱扔东西啊