I kept looking at the man, wondering _______.
A．whether I have seen him beforeB．whether I had seen him before
C．that I had seen him beforeD．when I saw him before
B
這題考查賓語從句的時態(tài) ，因為是before強調(diào)的是過去的過去，要用過去完成時，wonder“想知道”后面應(yīng)該是疑問詞引導(dǎo)的賓語從句。選B。
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