It must be John who is in the office.I'm sure it()be John.Isaw him off at the railway station justtwenty minutes ago.A.won't B.mustn't C.can't D.needn't选哪个?为什么?

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It must be John who is in the office.I'm sure it()be John.Isaw him off at the railway station justtwenty minutes ago.A.won't B.mustn't C.can't D.needn't选哪个?为什么?

It must be John who is in the office.I'm sure it()be John.Isaw him off at the railway station justtwenty minutes ago.A.won't B.mustn't C.can't D.needn't选哪个?为什么?
It must be John who is in the office.I'm sure it()be John.Isaw him off at the railway station just
twenty minutes ago.
A.won't B.mustn't C.can't D.needn't
选哪个?为什么?

It must be John who is in the office.I'm sure it()be John.Isaw him off at the railway station justtwenty minutes ago.A.won't B.mustn't C.can't D.needn't选哪个?为什么?
选C 这里表示肯定的回答 后面说道了 I'm sure it 而且为了进一步证明 有说到Isaw him off at the railway station just twenty minutes ago.(20分钟前在火车站我看见他离开的)
表示肯定的回答 用 can 他的否定形式 是 can't
mustn't 意思是 务必…… needn't 意思是 没有必要 …… won't 表示将来 怎样

C.can't 一定不

C
表示否定，用can't

C.can't 为正确选项。
can't 是不可能的意思，符合题意。其它三个选项都不符合。
A.won't 不是
B.mustn't 不能，不可以
D.needn't 不必
答句的意思是，“我肯定（ 那人）不可能是John，20分钟前我刚刚在火车站给他送行呢。”
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C.can't 为正确选项。
can't 是不可能的意思，符合题意。其它三个选项都不符合。
A.won't 不是
B.mustn't 不能，不可以
D.needn't 不必
答句的意思是，“我肯定（ 那人）不可能是John，20分钟前我刚刚在火车站给他送行呢。”
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C不可能是John
A，将来时态，排除
B，语气太强硬，表示禁止
D，不需要，显然不对

选择C根据句子的意思 不可能是它

选C can't 用于否定推测，表示“不可能”
A 不会
B 禁止，千万不要
C 不可能
D 不必
用法引申：can 只能用于否定和疑问句，而could否定,肯定均可
may, might 只能用于肯定句,表示“可能”（特例：表示可能不）

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