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When ______ if he had any idea of what the novel was about, Jack just kept silent.
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A
asking
B
asked
C
to ask
D
being asked
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         is known to us all, he is an excellent student in our class.
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Who
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I never doubt ________ he was dedicated to our firm.
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which
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       you don’t like him is none of my business.
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B
Who
C
That
D
Whether