The young man insisted that he______ these watches and______free.A.stolThe young man insisted that he______ these watches and______free.  A.stole,set B.had stolen,be set C.steal,be set D.had stolen; must be set为何选B

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The young man insisted that he______ these watches and______free.A.stolThe young man insisted that he______ these watches and______free.  A.stole,set B.had stolen,be set C.steal,be set D.had stolen; must be set为何选B
The young man insisted that he______ these watches and______free.A.stol
The young man insisted that he______ these watches and______free.
  A.stole,set B.had stolen,be set C.steal,be set D.had stolen; must be set
为何选B

The young man insisted that he______ these watches and______free.A.stolThe young man insisted that he______ these watches and______free.  A.stole,set B.had stolen,be set C.steal,be set D.had stolen; must be set为何选B
前面一空表示过去一件实事,所以表示过去的过去
第二空表示虚拟语气,所以用should+do的结构