单选题在船上应当日落时降下国旗.（）AWe should lower national flag when the sun sets.BWe should lower national flag when the ship is in port.CWe should lower national flag when loading and unloading.DWe should lower national flag when the sun rises.
单选题
在船上应当日落时降下国旗.（）
A
We should lower national flag when the sun sets.
B
We should lower national flag when the ship is in port.
C
We should lower national flag when loading and unloading.
D
We should lower national flag when the sun rises.
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