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
Federal troops were used to _________ a crowd that tried to storm the jail.
A．deteriorate
B．disperse
C．dissipate
D．drain
单项选择题
That remote _________ mountain country has become great tourist attraction since 1990s.
A．vacant
B．barren
C．, weird
D．bald
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