【题目】A man landed on Mars? You must be joking. It ______ be true.
A. mustn’t B. can’t C. needn’t D. won’t
在线课程【答案】B
【解析】
试题分析：考查情态动词。句意：人类到达火星？你一定在开玩笑，这不可能是真的。当表示确定语气的不可能时，用can’t，故选B项。
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