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Don’t all speak at once! ___ please.

A. Each at one time   B.One by one time  C.One for each time  D.One at a time

 Don’t all speak at once! ________, please

  A) Each at one time                  B) One by one time

  C) One for each time                 D) One at a time

Don’t all speak at once!  _____, please.

A. Each at one time     B. One by one time    C. One for each time   D. One at a time

Don’t all speak at once! _____ , please.

A. Each at one time　　　　　　　　 B. One by one time

C. One for each time　　　　　　 D. One at a time

16.[1994全國] Don't all speak at once! ________ , please.