问题
as put forward______ most challenging question for us to answer.—Yes, it really is. I have never heard______ harder one.
A:a; the
B:the; the
C:a; a
D:the; a;
B:the; the
C:a; a
D:the; a;
正确答案是：
同类题型
Some students can do very well in English exams, but can understand what a native speaker says.
It was not until the teacher had explained it threetimes _______ how to work out the problem.
If someone said ________ about you, would you beangry–No, I wouldn’t.
It is already 10 o’clock. I wonder how it ______ thatshe was two hours later on such a short trip.