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    So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ____ .
    A．mustn’t beB．may not beC．can’t beD．won’t be
    C
    考查情态动词。mustn’t不表示否定推测，may not“可能不”，可能性没有can’t大；won’t“不会”，不表示推测。根据firmly可知，其他人坚信不可能存在外太空生物。故选C。
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