问题

It is a difficult problem for high school studentsthey can properly use the Internet

A:what
B:where
C:when
D:whether

正确答案是：

同类题型

Which of the following underlined part is different in pronunciation with others

Read this article, _______ you will understand that not everything can be bought with money.

There are 3 ________________ people over there.

What You have donated $10,000 to the disaster area9 – Oh, no, _______. I don’t want tolet anybody but you know it.

She eats three _______ every day .