单项选择题

When drinking from a well, one mustn’t forget ( ) who dug it.

A．this
B．these
C．that
D．those
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单项选择题
The actual cost of the building was much higher than our original ( ).
A．consideration
B．judgement
C．estimate
D．plan
单项选择题
At the conference he expressed some personal views which brought him into ( ) with the Party leadership.
A．action
B．crisis
C．conflict
D．power
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