单项选择题

It is well known that knowledge is the ______ condition for expansion of mind.

A. incompatible
B. incredible
C. indefinite
D. indispensable
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单项选择题
It took him several months to（）the wild horse.

A. tend
B. cultivate
C breed
D tame
单项选择题
We are ______ with these experienced technicians.
A. too pleased to work
B. too pleased working
C. only too pleased to work
D. only too pleased working
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