单项选择题

A．on
B．of
C．at
D．in
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The writer ______ (如此专心致志地写作) that he forgot to tap the ashes, from his cigar.
单项选择题
A．regretfullyB．miserablyC．unfortunatelyD．instead
A．regretfully
B．miserably
C．unfortunately
D．instead
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