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if I --------- mr.jones was in the hospital,i --------------

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if I --------- mr.jones was in the hospital,i ---------------him a note and some flowers.
A knew,would send B had known,would have sent C knew,would have sent D had known,would sed 各位朋友们应该选那个那
if I --------- mr.jones was in the hospital,i --------------
选C
这是条件状语从句,主句是过去式,从句用过去完成时.
再问: 我选的是B 这个不是虚拟,与过去事实相反的那个么,这两个我老分不清楚,谢了,