问题
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 ______. width=”117″ valign=”top” style=”width:87.6pt;padding:0cm .5pt 0cm .5pt”
A: mustn’t be
B: may not be
C: can’t be
D: won’t be
B: may not be
C: can’t be
D: won’t be
正确答案是：
同类题型
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