单选题（）should ensure that adequate measures are taken to prevent alcohol and drugs from impairing the ability of watchkeeping personnel.AThe quarantine officersBAdministrationsCThe immigration officersDThe customs officers
单选题
（）should ensure that adequate measures are taken to prevent alcohol and drugs from impairing the ability of watchkeeping personnel.
A
The quarantine officers
B
Administrations
C
The immigration officers
D
The customs officers
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