This problem is very difficult to deal with. It’s really_______.A、convincingB、seriousC、t

The problem is so difficult that（) of us can work it out.

Which of the following sentences is NOT an emphatic sentence？A．This is the very question t

Its such a difficult problem______no one can work it out.A．asB．thatC．soD．this

We want to know what is the best way to find______to this extremely difficult problem.A．an

It is very difficult for a child to 【adhere to】 r

This question is very difficult ______ of the st