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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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
单项选择题
This is not the right ______ to ask for my help; I am far too busy even to listen!
A. moment
B. situation
C. opportunity
D. circumstance
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