---- Look! A man is cutting a tree on the moon.
----It ______ be true. The teacher said there is no air on the moon.
| A．can’t | B．may not |
| C．shouldn’t | D．mustn’t |
---- Look! A man is cutting a tree on the moon.
----It ______ be true. The teacher said there is no air on the moon.
| A．can’t | B．may not |
| C．shouldn’t | D．mustn’t |
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