The winter Olympics are usually held every four years.这个句子没错,但为什么有了are又用held?应该是一般现在时吧?

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• The winter Olympics are usually held every four years.这个句子没错,但为什么有了are又用held?应该是一般现在时吧?
• The winter Olympics are usually held every four years.这个句子没错,但为什么有了are又用held?应该是一般现在时吧?
• this is a red apple改为一般疑问句
• The Olympic Games are heldA every four years B every four year C every fourth years D every four-years