I watched the man for a long time and wanted to know .
A.whether I have seen him before
B.where I had seen him before
C.that I had seen him before
D.when did I see him
网友回答
B解析此题重点考查宾语从句的时态和语序问题，无论哪种句式结构充当宾语从句都要用陈述句语序，从句的时态要和主句的时态保持一致。因主句的谓语动词是过去式从句的谓语动词也要用相应的过去时态。