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    ---- do the birdwatchers do a bird count? ----Once a year. A. How many times B. How long C. How soon D. How often 【查看更多】

     

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    ----_______ a year do the birdwatchers do a bird count?　　

    ----Once a year.

    　　　 A. How many times　　 B. How long　　 C. How soon　　 D. How often

    　

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    －________ a year do the birdwatchers do a bird count?

    －Once a year.

    　 A. How many times　　 B. How long　　 C. How soon　　 D. How often

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