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【单选题】

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
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A.
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B.
that how swiftly we have affected
C.
how swiftly we have affected
D.
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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A.
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B.
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