问题

With the fast development of computer and Internet technologies, traditional printed books ______ by the growing popularity of online reading of e-books

A:are challenged
B:have challenged
C:are being challenged
D:have been challenged

正确答案是：

同类题型

It has been many years since I was last in London_______I still remember something that happened during that visit

Why does Sue look upset—She went to the bookstore by bus but she ______ the bus at the wrong stop.

He told me to ________, for he wanted to stay for a while all by himself.

What’s in the box Ah, ______ a cat, but I don’t know______ name.

_____?— He is kind but sometimes a little silly