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I kept looking at the man, wondering _______.

   A. whether I have seen him before   B. whether I had seen him before

   C. that I had seen him before        D. when I saw him before

I kept looking at the man, wondering _______.

   A. whether I have seen him before   B. whether I had seen him before

   C. that I had seen him before        D. when I saw him before

I kept looking at the man, wondering _____ .
A. whether I have seen him before.      B. where I had seen him before
C. that I had seen him before         D. when I had seen him before.

I kept looking at the man, wondering ________.

[　　]

A．whether I have seen him before

B．where I had seen him before

C．that I had seen him before

D．when I had seen him before