单项选择题


A．that
B．which
C．of
D．what
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单项选择题
A．urgentB．regularC．emergentD．security
A．urgent
B．regular
C．emergent
D．security
单项选择题
A．haveB．withholdC．withdrawD．withstand
A．have
B．withhold
C．withdraw
D．withstand
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