, 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](/pic/43_1443147.jpg)
______, none of these reference books was useful.[ ]A. Relevantly
B. Gradually
C. Unfortunately
D. Punctually
试题答案
C