In addition to all this there was evolved the theory that light is an electromagnetic disturbance.
句中all this 如何理解? 为什么不是all these ? 既然用了all, 为什么后接this, 而不是these呢?
all 可以修饰复数名词,不可数名词,还可以修饰单数名词,例如:
《韦氏词典》例句:
He stayed awake all night. [=the whole/entire night]
She worked hard all day. [=throughout the entire day]
I've been waiting all week to see her.
this 指代前文提及的一件事,而不是几件事,所以没有理由用all these.
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