问题

It was quite a serious mistake, ____caused by carelessness.

A:which I think was
B:I think which was
C:which I think it was
D:I think which it was

正确答案是：

同类题型

China is one of the developing countries ________ the third world.

born to win! The _____ to success is in our genes, say scientists.

A: children there are in a family, their life will be. B: Yes, everyone thinks so.

What did you do last weekend?—Oh，nothing________

you ever been toBeijing”— “No, but I wish I _____”