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
A．knownB．definedC．calledD．referred to
A．known
B．defined
C．called
D．referred to
单项选择题
A．on thatB．on whichC．at thatD．at which
A．on that
B．on which
C．at that
D．at which
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