问题

With the development of science and technology,there is no doubt________Chinese astronauts will land on the moon in the near future.[ ]

A: whether
B: that
C: what
D: which

正确答案是：

同类题型

29．The attackers were arrested and didn’t know where they ______

It____be thepostman at the door. It’s only six o’clock.[ ]

—Mum，I really think Dad should have a break and get relaxed. —Yes. He too long. [ ]

These________ my friends and that________ my aunt.

It is __________to visit so many places of ________around the world. I never feel _________when I see them.