语法练习6-38thecause,wewereabletoproposeawayofcuringyourheadacheA.WhenwewerefindingB.AfterwehavefoundC.FindingD.Havingfound

Question

语法练习6-38
______ the cause,we were able to propose a way of curing your headache
A.When we were finding
B.After we have found
C.Finding
D.Having found

Answer 1

你可以用排除法做,由于后面的句子是发生在后面的事情,（先找原因,后治疗头痛）,所以语法上前面的状语从句或者是状语短语应该是过去式或者过去完成时,所以排除B,Cfinding作状语表现在,是现在分词,所以也排除；A的话意思不对,不能表达前后,所以选D.当然选D还是有原因的,即完成时的非谓语动词（having+动词过去分词）表示过去状态.