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

Mum told Andrew ______ quiet in the museum.

This ticket _____ one adult and one child to the show

Perhaps each of us has moments in our lives _____we desperately search for something everywhere but it is just under our noses.

We all felt ______ after watching this ______ match.

The bridge is made _________steel, ______ it