作业帮the sea,___their economies have always been based on ,is suddenly threatening their existence.A.on which B .where (CD选项不写了）我选的是B,还有,难道不是on which =where 这到底是为什么T 求拯救!打错了！base 后面没有on..
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the sea,___their economies have always been based on ,is suddenly threatening their existence.A.on which B .where (CD选项不写了）我选的是B,还有,难道不是on which =where 这到底是为什么T 求拯救!打错了！base 后面没有on..
the sea,___their economies have always been based on ,is suddenly threatening their existence.
A.on which B .where (CD选项不写了）
我选的是B,还有,难道不是on which =where 这到底是为什么T 求拯救!
打错了！base 后面没有on...
the sea,___their economies have always been based on ,is suddenly threatening their existence.A.on which B .where (CD选项不写了）我选的是B,还有,难道不是on which =where 这到底是为什么T 求拯救!打错了！base 后面没有on..
那就是A,base后面要有介词on,介词提前,而on后要有宾语,用which.
B
A. on which 是 based on which 的意思=基于某某 的意思
1.既然你原句没有介词, 那就要找回介词，怎么找呢？是有根据的，就是be based on, 因此你选有on的那个.
2.their economies 是主语 have always been based （on可提到引导词前）是谓语，缺少宾语，where不能做宾语，只做状语，which能做宾语，因此选A。
3.至于你说的情况，where=介词+which是指作状语时通用,我举个...
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1.既然你原句没有介词, 那就要找回介词，怎么找呢？是有根据的，就是be based on, 因此你选有on的那个.
2.their economies 是主语 have always been based （on可提到引导词前）是谓语，缺少宾语，where不能做宾语，只做状语，which能做宾语，因此选A。
3.至于你说的情况，where=介词+which是指作状语时通用,我举个例吧：
The place, in which I live, is beautiful.
The place, where I live, is beautiful.
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