my uncle is an actor,and he's very handsome .that man is ugly .he ()my uncle1.must not be2.isn't3.won't4.can't be

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my uncle is an actor,and he's very handsome .that man is ugly .he ()my uncle1.must not be2.isn't3.won't4.can't be
my uncle is an actor,and he's very handsome .that man is ugly .he ()my uncle
1.must not be
2.isn't
3.won't
4.can't be

my uncle is an actor,and he's very handsome .that man is ugly .he ()my uncle1.must not be2.isn't3.won't4.can't be
4
不可能是.
can表示猜测,用在否定句中.

4 表示不可能