12．--How often are the Olympic Games held? -- four years. A. Every B. Each C. In——青夏教育精英家教网—

摘要：12．--How often are the Olympic Games held? -- four years. A. Every B. Each C. In D. For

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---How often are the Olympic Games held？

---_____four years.

A. Every B. Each C. In D. For

---How often are the Olympic Games held？ ---_____four years.

A．Every

B．Each

C．In

D．For

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