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情态动词用法I just can't understand that you ( ) think I knew some

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情态动词用法
I just can't understand that you ( ) think I knew something about the arrangement. How ( ) I know?
A.could... could B. should... must C.would... should D.might... might

这里是要按照虚拟语气来理解么? 我选的A 但正确的是C
情态动词用法I just can't understand that you ( ) think I knew some
could主要用于if条件句的主句或指过去客观或主观能力、可能性能够做...以及现在客气礼貌地请求,而should指的是客观或主观情况下应该做,也用于be型虚拟语气...would 指的是主观上打算做什么.
Had I been born 10 years elier I could have witnessed the cruelty of the war.
如果我早生10年,就能亲眼目睹战争的残酷.
I could swim in the sea when I was young.Could you help me please?