问题
选择题
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
答案
答案：B
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。