All passengers should present their______documents at the check-in counter.
A.boarded
B.boarding
C.to board
D.boards
第1题
A.returned
B.known
C.taken
D.held
第2题
A.those
B.what
C.that
D.where
第3题
A.amounts
B.types
C.kinds
D.parts
第4题
A.original
B.originally
C.originated
D.originality
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