It must be a spaceship.改为否定的猜测It ______ ________a spaceship.

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It must be a spaceship.改为否定的猜测It ______ ________a spaceship.
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It must be a spaceship.改为否定的猜测It ______ ________a spaceship.
It must be a spaceship.
改为否定的猜测
It ______ ________a spaceship.

It must be a spaceship.改为否定的猜测It ______ ________a spaceship.
can't be

mustn't be

can't be
因为must 的否定形式是can't

it can't be a spaceship.