That must be a mistake,___ it?A mustn't B can't C isn't 选什么,为什么?

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Thatmustbeamistake,___it?Amustn''tBcan''tCisn''t选什么,为什么?Thatmustbeamistake,___it?Amustn''tBcan''tCisn''t选什

That must be a mistake,___ it?A mustn't B can't C isn't 选什么,为什么?
That must be a mistake,___ it?A mustn't B can't C isn't 选什么,为什么?

That must be a mistake,___ it?A mustn't B can't C isn't 选什么,为什么?
That must be a mistake,___ it?
A mustn't B can't C isn't
答案:C

C isn't
看见must了吧,be 才是个动词,因为单数,所以 isn't

c
a mistake 是单数
首先can't排除
然后must的疑问句和否定句用的不是must 和mustn't
排除也知道应该选c

A. 吧。前面有 must 后面就要跟。
如果换个说法,
there is a mistake, 后面就要跟 Isn't it.