问题

_____ there are living creatures in the outer space as those on Earth hasn’t been proved until now. [ ]

A: How
B: When
C: Where
D: Whether

正确答案是：

同类题型

We ____ each other since childhood.

______Monday _______Tuesday is OK. I’ll be free then.

I feel it is you rather than the boy who________for being late for the speech.[ ]

You can ask him again if you like , but itwon’t make any —he’ll still say no .

1I called Mary many timesyesterday evening. But I couldn’t get through. Her brother _____ onthe phone all the time.