Question

By the time Cynthia books the flight to Iceland, she _______ her sister about the visit.
has called
will has called
calls
will have called
called

Answer 1

By the time Cynthia books the flight to Iceland, she WILL HAVE CALLED her sister about the visit.

Answer 2

By the time Cynthia books the flight to Iceland,
she will have called her sister about the visit.