Hello, Giulia—and welcome to English Forums. Giulia Scalz The key to the test says "C. will" is the correct choice, couldn't I also say "B should" if I'm not sure what age Walter is?
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Giulia ScalzThe key to the test says "C. will" is the correct choice, couldn't I also say "B should" if I'm not sure what age Walter is?Yes, you could, but C is by far the more usual choice.
Giulia ScalzThe key says "B. have been" is the correct one... I'm a bit puzzled as I was sure it was A