问题
选择题
They _____ this estimate ______ the figures for the last three years. [ ]
A. are based; with
B. based; according to
C. are based; on
D. based; upon
答案
答案：D
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They _____ this estimate ______ the figures for the last three years. [ ]
A. are based; with
B. based; according to
C. are based; on
D. based; upon
答案：D