He'll be an astronaut by the time he ______ thirty.
A: is
B: had been
C: will he
D: is going to be
A: is
B: had been
C: will he
D: is going to be
举一反三
- 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 ________ (be) thirty.
- He’ll be an astronaut by the time he_____thirty.
- He’ll be ____ astronaut? A: a B: an C: do
- It was the third time he _______ in love that year. A: had been B: was C: has been D: will be