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
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(答案→)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
解析：考查宾语从句。所有的宾语从句都使用陈述语序，排除CD。句意：我观察那个人很长时间。想知道我是否在以前看见过他。根据句意说明A正确。