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
—A number of people ________ learning English nowadays.
—Yes. The number of people who are learning English ________ increasing.
| A．is; is | B．are; are |
| C．are; is | D．is; are |
Our manager is so ________that she won't change her mind, so we have to change our plan.
| A．reliable | B．stubborn |
| C．patient | D．careless |
I said hello to you in the street yesterday, but you ________ me completely.
—I'm sorry. Maybe I didn't notice you.
| A．cheated | B．hid |
| C．ignored | D．recognized |
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