He must be in the library now,________? A. doesn't he B.mustn't he C.needn't he D .isn't he答案选D,求解释.

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He must be in the library now,________? A. doesn't he B.mustn't he C.needn't he D .isn't he答案选D,求解释.

He must be in the library now,________? A. doesn't he B.mustn't he C.needn't he D .isn't he答案选D,求解释.
He must be in the library now,________? A. doesn't he B.mustn't he C.needn't he D .isn't he
答案选D,求解释.

He must be in the library now,________? A. doesn't he B.mustn't he C.needn't he D .isn't he答案选D,求解释.
要看 must 在这个句子中属于什么词性,充当什么成分的
例句中的动词是be 也就是is的原型,must并不是情态动词,而仅仅表示猜测,所以选D
楼主可以看下这个贴,就能明白了

He must be in the library now: 他现在肯定在图书馆
A: doesn't he: 肯定不对,因为前面用的be动词,后面不可能用doesn't
B.mustn't he:意思是“他不能吗?”
C.needn't he:意思是:“他需要吗?”
D .isn't he:意思是:“是这样吗?”
选D

D

看这句话的时间,是now。“must be”是表示肯定猜测的,其实这句话简单说也就是“He is in the library now”,那它的反义疑问就是“isn't he”,所以选D。A是表示一般情况下,而该句是现在时态;B明显错误,must be的否定是can't be;C意思不对。

must在这里属于情态动词,情态动词是无法用于的反问的。

我记得这是特殊情况

疑问句重点在be in the library,must 表肯定语气的猜测,如果你i想选B,mustn't表示的是不允许,就不是原来对他是不是在那里的猜测了。不知道你听懂没

其实做此类选择题可以用排除法,首先把A和C排除了,does 和 need在句中压根没提到,肯定是错的。最有可能造成混淆的就是B和D了。我们要从must这个词来入手,首先判断一下句中这个must是什么意思,是解释成必须呢,还是表示猜测(一定)的意思,根据句子的意思来讲应该是后者,现在他一定是在图书馆,在此种表示猜测的情况下是对must后面的动词进行反问,所以是对be动词进行反问,He是第三人称,用i...

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其实做此类选择题可以用排除法,首先把A和C排除了,does 和 need在句中压根没提到,肯定是错的。最有可能造成混淆的就是B和D了。我们要从must这个词来入手,首先判断一下句中这个must是什么意思,是解释成必须呢,还是表示猜测(一定)的意思,根据句子的意思来讲应该是后者,现在他一定是在图书馆,在此种表示猜测的情况下是对must后面的动词进行反问,所以是对be动词进行反问,He是第三人称,用is,自然反问就是isn't。
综上选D
希望我的回答让你能够把此类题目都能消化,望采纳!

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