--This is for you.--You ____ have!I don't know how to thank you.A.mustn't B.couldn't C.needn't D.shouldn't答案是3.why?

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• --This is for you.--You ____ have!I don't know how to thank you.A.mustn't B.couldn't C.needn't D.shouldn't答案是3.why?
• --This is for you .---You ____have I don't know how to thank you.答案是needn't还是shouldn't --This is for you .---You ____have I don't know how to thank you.有的说答案是:needn't 你不用给我准备这个的 shouldn't 带有命令口气，人家给你一礼物，你不高兴的说“不准给我礼物”。有的说答案是:应该是shouldn't 不应该，needn't是不需要 到底哪个正确
• --This is for you.--You ____ have!I don't know how to thank you.A.mustn't B.couldn't C.needn't D.shouldn't答案是D.为什么不选择C呢?
• --This is for you.--You ____ have!I don't know how to thank you.
• --This is for you .---You ____have I don't know how to thank you.答案是needn't还是shouldn't
• I don’t know _______ they have passed the exam.这里答案是if/whether,但是我觉得when跟how填进去也说得通啊.请问为什么不能填when跟how、?
• --This is for you.--You ____ have!I don't know how to thank you.
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• --This is for you .---You ____have I don't know how to thank you.答案是needn't还是shouldn't --This is for you .---You ____have I don't know how to thank you.有的说答案是:needn't 你不用给我准备这个的 shouldn't 带有命令口气，人家给你一礼物，你不高兴的说“不准给我礼物”。有的说答案是:应该是shouldn't 不应该，needn't是不需要 到底哪个正确