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
考查情態(tài)動詞。mustn’t不表示否定推測，may not“可能不”，可能性沒有can’t大；won’t“不會”，不表示推測。根據(jù)firmly可知，其他人堅信不可能存在外太空生物。故選C。
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