问题

He gave us another piece of advice, ________ of great help to the research work.

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

正确答案是：

同类题型

I don’t have a ping-pong ball, ______ my sister ______.

17— I’m sorryI ____ hurt you— Forget it

No wonder he looks tired! He’s been studying for the exams all week, ____ he’s been working in a bar at night

is little doubt in your mind that he isinnocent, ________

________ surprised me most was________