大哥哥 姐姐 帮下忙了 1.（ ）-Is Jack on duty today?-lt________be him.lt's his turn tomorrowA mustn't B won't C can't D needn't

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大哥哥 姐姐 帮下忙了 1.（ ）-Is Jack on duty today?-lt________be him.lt's his turn tomorrowA mustn't B won't C can't D needn't

大哥哥 姐姐 帮下忙了 1.（ ）-Is Jack on duty today?-lt________be him.lt's his turn tomorrowA mustn't B won't C can't D needn't
大哥哥 姐姐 帮下忙了
1.（ ）-Is Jack on duty today?
-lt________be him.lt's his turn tomorrow
A mustn't B won't C can't D needn't

大哥哥 姐姐 帮下忙了 1.（ ）-Is Jack on duty today?-lt________be him.lt's his turn tomorrowA mustn't B won't C can't D needn't
C
注：can't 不可能,表“推测,判断”
mustn't 一定不要,不许,表“命令,禁止”.

C can't

C

c
a是千万不能
b是将来时
d是不需要

C。 can't 不可能是

C 表示相当的肯定~~~

C

C不可能

C 明天轮他值日,说明今天不是,即用must的否定can't

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