单项选择题

While we were visiting our navy , the soldiers took us twice ______ in the open sea.

A．gliding
B．cruising
C．piloting
D．patrolling
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单项选择题
Since there is no ______ , why don't we work on it now
A．option
B．duty
C．obligation
D．penalty
单项选择题
This idea is ______ , it can not stand any test.
A．vulnerable
B．subjective
C．subordinate
D．liable
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