[单选题]every magnet is surround by a magnetic field.

A
It believes that
B
It believed that
C
It is believed that
D
It is believing that
正确答案:C
题目解析
It is believed that...理解为“据信...”/“人们相信...”,如It is believed that fortune-tellers can foretell your fate.人们相信算命人可以预测你的命运。题中的句子理解为“人们相信每块磁铁都被磁场包围。”
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