By the time Cynthia books the flight to Iceland she _______ her sister about the visit.

By the time Cynthia books the flight to Iceland she _______ her sister about the visit.

a. Has called

b. Will has called

c. Calls

d. Will have called

e. Called

D is the correct option. Therefore ”will have called” must be taken. it is correct because it expresses a pre-action prior to the time she will book the flight. This means that Cynthia will have to call her sister before she books the flight.

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