单项选择题

After the heavy rain, a builder was called to repair the roof, which was ______.

A. leaking
B. trickling
C. dripping
D. floating
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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
单项选择题
His ______ brain has worked away on the idea of a universal cure.
A. rich
B. quick
C. productive
D. fertile
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