摘要：21．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
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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 |