问题

no life has been found outside the earth, but while some scientists areactively searching for living things in outer space, others firmly believethere ____ .

A:mustn’t be
B:may not be
C:can’t be
D:won’t be

正确答案是：

同类题型

dney Opera house , which ________almost 900 rooms and halls of different sizes, is our first stop in Australia

－ Take one more pen. If your pen doesn’t work during the exam,you can use the other one.－ OK, Mum. You are always_______.

Sally was ____________ to see herfriend off at the airport.

The wine industry in the area has developed in a special way, _________little foreign ownership[ ]

Roy thinks he works as as his friend, Dan.