He’ll be an astronaut by the time he ________ (be) thirty.
举一反三
- He'll be an astronaut by the time he ______ thirty. A: is B: had been C: will he 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
- He’ll be an astronaut by the time he_____thirty.
- He’ll be ____ astronaut? A: a B: an C: do
- ____ time, he’ll make a first-class tennis player.