问题

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

A:is
B:are
C:was
D:were

正确答案是：

同类题型

I am________ they can play in this heat.

Many Chinese students think sciencesubjects are _______ foreign languages.

The latest edition of Harry Porter has been a best-seller for 3 weeks_______

______Jim ______his cousin has been to America，so________ of them knows the country well.

下列各句中，表达得体的一句是