问题

Just as sound travels through the air in waves, electricity travels through the air in ______ radio waves.

A:what is called
B:which is called
C:what it is called
D:which it is called

正确答案是：

同类题型

Little Tom admitted ______ in the examination, giving the teacher his word that he wouldn’t do that again.

The criminal, as well as some ______people, was arrested by the police yesterday.

What is this — It’s a ______.

If it _____ another ten minutes, the game would have been called off.

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