问题

The visiting professor gave us some advice, ____ of great help to our English learning.

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

正确答案是：

同类题型

You’ve left the light on—OhSo I have________and turn it off

下列各句中加点的成语，使用恰当的一项是（）

Their school has more than two _____ teachers and _____ students.

This tall building has _______ floors. And Tony lives on the ______ floor.

The cities’ bright lights，theatres，films，etc.are________.