问题
选择题
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
答案
答案：B
这题考查宾语从句的时态 ，因为是before强调的是过去的过去，要用过去完成时，wonder“想知道”后面应该是疑问词引导的宾语从句。选B。