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 be
B. may not be
C. can’t be
D. won’t be
C
這題考查情態(tài)動(dòng)詞的用法：can’t be“不可能”句意是：到目前為止沒(méi)有發(fā)現(xiàn)生命在地球上，但有些科學(xué)家正在積極尋找生物在外層空間，別人相信不可能有。選C
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