题目内容
—You see, a man is cutting a tree on the moon.
—It _________ be true. The teacher says there is no air on the moon.
—It _________ be true. The teacher says there is no air on the moon.
[ ]
A. can't
B. may not
C. shouldn't
D. mustn't
B. may not
C. shouldn't
D. mustn't
A
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