问题

The United States of America _____one ofthe most developed countries in the world

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

正确答案是：

同类题型

The computer requires _____. I think I need ______ to ask Mr. Zhang for help.

The dish smells________ and you’d better throw it away.

Ifeelitisyouwho_________fortheaccident. [ ]

下列实用文体表述正确的一项是

I don’t know when he will arrive.—Don’t worry. I’ll call you as soon as he _____.