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
The man in black is suspected to be a shrewd spy behind the mask of an automobile business- man and the police therefore begin to______ his every move.
A．mobilize
B．warrant
C．manipulate
D．supervise
单项选择题
Jennifer holds on that her outstanding achievement in languages comes from her diligence rather than her being______ at languages.
A．feasible
B．apt
C．appropriate
D．fitting
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