A claused B/L may be also referred to as "a/an（）B/L."

A claused B/L may be also referred to as "a/an（）B/L."
A.dirty
B.filthy
C.foul
D.unclean
正确答案：A

A claused B/L may be also referred to as &quot;a/an（）B/L.&quot;