______of them knew about the plan because it was kept a secret.

A．Each             B．Any              C．No one           D．None

_____ of them knew about the plan because it was kept a secret.
  A.Each         B.Any          C.No one         D.None

_______ of them knew about the plan because it was kept a secret.

[    ] 　　

A. Each   B. Any   C. No one   D. None 

________ of them knew about the plan because it was kept in a secret.

[　　]

________ of them knew about the plan because it was kept in a secret.

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