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 |
相关试题
_______ in a friendly way, their quarrel came to an end.
| A．Being settled | B．Settled | C．Settling | D．Having settled |
There was a traffic jam. ___________，he was late.
A As a result B As a result of C As the res
ult D As result
The population of China is larger than ______ of the United States.
| A．this | B．that | C．these | D．those |
推荐套卷
粤公网安备 44130202000953号