_江苏成考网

S: I’m sorry. Professor Johnson is not here at the moment. This is his assistant, Sally.  _____52_____?

The reason________the president kept silent is still unknown.

• A、how

• B、why
  

• C、when 
  

• D、what

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!