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如果想对所说内容进行补充，有时可以用介词加 which 以及名词开头的非限定性从句来添加额外信息。名词常用 time、point、case 或 event。
例如：
She may be late, in which case we ought to wait for her.（这个 case 指的是 she may be late）
He lost his temper, at which point I decided to go home. （这个 point 指的是 he lost his temper）
He was appointed Lord Chancellor, in which post he spent the rest of his life.（这个 post 指的是 Lord Chancellor）
They remain in the pouch for some seven weeks, by which time they are about 10 cm long.（这个 time 指的是 seven weeks）
所以，先回答楼主的问题，which 后面加上名词是正规的用法。
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然而，川普的用法却貌似并不正规。首先，虽然前面有提及 subsidized projects，但也提及 help，然后还有一大堆 electric cars，driverless cars 和 rocketships，所以 which 的指向并不清晰。另外，即使你理解是 subsidized projects，或者里面所包含的 subsidies 的意思，两者相距大遥远了，所以也不是一个很好的结构。我个人认为，直接说 and without subsidies he'd be worthless 便已经足够。
（仅供参考） |
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