You should lower the ensign when the sun sets.（）A、日出时应该升国旗。B、日出时应该降国旗。C、日落时应该降国旗。D、日落时应该升国旗。
You should lower the ensign when the sun sets.（）
- A、日出时应该升国旗。
- B、日出时应该降国旗。
- C、日落时应该降国旗。
- D、日落时应该升国旗。
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