请帮解释一下这题为什么选 unless ：shall David go to see the film not unle

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请帮解释一下这题为什么选 unless ：shall David go to see the film not unless he has finished...
---Shall David go to see the film?
---Not ____ he has finished his homework.
A.Since B.Once C.When D.Unless
我懂选unless ,其实是不懂其他三个为什么不能选?麻烦帮具体说明其他三个选项错在哪里?或者是通过意思来看unless 最好,其他的从语法上没错

1.答案的确是选D.
2.要做出此题,必须把答句中的Not写完整才行.
--Shall David go to see the film?
--Not ____ he has finished his homework.
=David/He can/will not go to see the film ____ he has finished his homework.
翻译：--要不让大卫去看电影怎么样?
--____他完成了作业,他就不能去看电影.
3.各选项解释：
A.Since “由于/既然”,放入句中则句意不通；
B.Once “一旦”,放入句中则句意也不通；
C.When “当...时候”,放入句中则句意也不通顺；
D.Unless “如果不/除非”,放入句中,句意刚好通顺,即：
如果他没有完成作业/除非他完成了作业,他就不能去看电影.

请帮解释一下这题为什么选 unless ：shall David go to see the film not unle let us go to see the film,shall we?改错 Shall+we+go+to+see+a+film? shall we go to see a film We decided _____ (not go) to see the film. shall we go to the cinema?< > go to see a film,< > we? Shall we go to the cinema?改为同义句 ----- -----to see a film. shall we go to see a film意思请老师帮我看一下英语问题,问题是这样的I didn't go to see the film la You'd better___ to see the film A don't go B go not C not go I ______ (see) the film before I_______ (not go)to the cinem I haven't decided whether l'll go to see the film or not.保持愿