Duty Sailors must greet visitors （）on gangway.

A.polite
B.politely
C.impolite
D.impolitely

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单项选择题

A.took
B.take
C.taking
D.taken

单项选择题

A. wait a moment
B. go
C. stand
D. Sit down.

单项选择题

-How do you do, Chief Officer!
-（）

A. How are you?
B. Fine, thank you.
C. How do you do?
D. Not at all.

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