单项选择题

He______with gratitude the help of his supervisor in the accomplishment of his B.

A. thesis.A. expressed
B. confessed
C. verified
D. acknowledged
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单项选择题
They have used every means______to relieve the suffering of the refugees．
A．at their convenience
B．at their will
C．at their request
D．at their disposal
单项选择题
Whoever enters this country must______with the law，or she he will be punished accordingly．
A．confine
B．consent
C．conform
D．comply
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