单项选择题

Successive committees have ______ over this problem without finding a solution.

A．reckon
B．ponder
C．speculate
D．presume
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单项选择题
He carries out a lot of ______ on his friends who lent him money.
A．alien
B．client
C．counterpart
D．fraud
单项选择题
The book ______ too much on the economic aspects of the problem.
A．hesitates
B．lingers
C．retains
D．dwells
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