He wlll be an astronaut by the time he ____ thirty. A: will be B: has been C: is D: is going to be
He wlll be an astronaut by the time he ____ thirty. A: will be B: has been C: is D: is going to be
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He wlll be an astronaut by the time he ____ thirty. A: will be B: has been C: is D: is going to be