单项选择题

When a ship is in port, （）must keep a gangway watch.

A.officers
B.crew members
C.sailors
D.motorman

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单项选择题
When a ship is in port, the sailor on duty （）a gangway watch.

A.has
B.keeps
C.looks
D.takes
单项选择题
Hang national flag upside down should be strictly （）.

A.prohibit
B.prohibited
C.prohibiting
D.prohibits
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