问题

I don’t know ______ with this problem. It’s too hard.

A:which to do
B:when to do
C:what to do
D:how to do;

正确答案是：

同类题型

Miss Li ___as a secretary for five years in the company, and now she is general manager of it[ ]

There is no doubt _____ he’s an honest boy ,so there is no doubt _____ his honesty.

With the development of science and technology,there is no doubt________Chinese astronauts will landon the moon in the near future.[ ]

The pictures made me think of the days _____ we spent in Beijing.

Please don’t make so much noise. The baby now.