英语填空The officer gave an order that everyone ___back before d

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英语填空
The officer gave an order that everyone ___back before dark.
A.get B.would get C.had to get D.must get

D
长官下了道命令每个人必须天黑前返回
A时态不对,如果说省略了should,那么意思也不对
长官下了道命令每个人应该天黑前返回
命令不够强硬
B长官下了道命令每个人天黑前将返回
无厘头的答案,不通
类似句子
The police were given an order that the stolen documents must be recovered at all costs.
比较have to和must
那么最有可能的C为什么不对?
1) 两词都是'必须'的意思,have to 表示客观的需要,must 表示说话人主观上的看法,既主观上的必要.
My brother was very ill,so I had to call the doctor in the middle of the night.我弟弟病得很厉害,我只得半夜里把医生请来.(客观上需要做这件事)
He said that they must work hard.他说他们必须努力工作.（主观上要做这件事）
2) have to有人称、数、时态的变化,而must只有一种形式.但must 可用于间接引语中表示过去的必要或义务.
He had to look after his sister yesterday.
3）在否定结构中：don't have to 表示"不必"
mustn't 表示"禁止",
You don't have to tell him about it.你不一定要把此事告诉他.
You mustn't tell him about it.你一定不要把这件事告诉他.

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