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

The 18 college studentsinFudan University should______________show their greatest respect to their hero–‘Zhang Ninghai instead of being cold and unfeeling[ ]

I must return the camera to Cindy. I______it for two weeks.

Not until he arrived home _____ he find that this wallet had been stolen.

I’d like to go with you, I’m too busy.

I am __________ endless examinations. —Cheer up, David. Keep on until the college entrance examination ends.