问题

The great invention he made ___ of great benefit to the whole world.[ ]

A: is proved
B: has proved
C: has been proved
D: is proved to be

正确答案是：

同类题型

_______ that Tom got inside the room to see what was going on

He cooked admit

If I _______ you, I would give some flowers to her.

We must set aside some money for a rainy day __________ run out of our income immediately.

I hope what I say will the situation.[ ]