高三语法题:The special medicine for the disease was difficult to

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高三语法题:The special medicine for the disease was difficult to find though ____ everywhere.
The special medicine for the disease was difficult to find though ____ everywhere.
A.sought B.having sought C.being sought D.having been sought
为什么不用D而要选A

主句用了过去时,从句如果想用完成时,也只能用过去完成时,而且这里从意思上看也只能用过去时.

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