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, none of these reference books was useful. [ ]A. RelevantlyB. GraduallyC. Unfor

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, none of these reference books was useful. [ ]A. RelevantlyB. GraduallyC. Unfor

______, none of these reference books was useful.[      ]A. Relevantly
B. Gradually
C. Unfortunately
D. Punctually

试题答案

C