单项选择题

Everyone involved in this matter should make a _________ not to leak the secret.

A．pledge
B．warranty
C．assurance
D．guarantee
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单项选择题
My parents thought it was _________ for a boy to be interested in ballet.
A．novel
B．disordered
C．extraordinary
D．abnormal
单项选择题
Methods of controlling expenses are a mere _________ of the levels of trust in an organization.
A．reaction
B．reflection
C．response
D．revelation
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