单项选择题

The statistics ______ that living standards in the area have improved drastically in recent times.

A. proves
B. is proving
C. are proving
D. prove
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His ______ brain has worked away on the idea of a universal cure.
A. rich
B. quick
C. productive
D. fertile
单项选择题
______ dull he may be, he is certainly a very successful top executive.
A. Although
B. Whatever
C. As
D. However
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