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P: Hello, this is Peter speaking. _____51_____, please?

P: No, not very serious, but the doctor told me to stay in bed and have a good rest.
S: I see. I’ll  _____55_____ as soon as he came back.
P: Thank you. Goodbye!
S: Bye!

The reason________the president kept silent is still unknown.

• A、how

• B、why
  

• C、when 
  

• D、what