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A man landed on Mars?You must be joking．That__________be true．
A.mustn’t
B.won’t
C.can’t
D.shan’t
B.won’t
C.can’t
D.shan’t
参考答案
参考解析
解析：can表推测，可能性，其否定形式为“call’t”意为“不可能”。本句意为有人登上了火星 你肯定再开玩笑，这不可能是真的。故选C。mustn’t意为“将不”；won’t意为“将不”；shan’t意为“不应该”代入句子中均不合适，故应排除。
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