as it did中的did指代了前文中的give rise to curious situations.
作用相当于,回答一般疑问句时候的Yes, I do. 不是实际意义:做.所以不需要宾语.
in the case of 确实相当于副词,做状语.
因为介词短语一共只有三个功能.
相当于副词,担任各种状语.e.g. I get up at 6:00.
担任表语.e.g. I am at school.
担任后置定语. e.g. The boy under the tree is Tom.
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